**US CITEL PCC-II FACT SHEET**

+----------------------------------+--------+--------------------------+
| Study Group: PCC-II              |        | Date: 21 March 2007      |
|                                  |        |                          |
| Document: USPCCII/XX             |        |                          |
+----------------------------------+--------+--------------------------+
| **Document Title:**              |        |                          |
|                                  |        |                          |
| **AI 1.14,** to review the       |        |                          |
| operational procedures and       |        |                          |
| requirements of the Global       |        |                          |
| Maritime Distress and Safety     |        |                          |
| System (GMDSS) and other related |        |                          |
| provisions of the Radio          |        |                          |
| Regulations, taking into account |        |                          |
| Resolutions **331 (Rev.WRC‑03)** |        |                          |
| and **342 (Rev.WRC‑2000)** and   |        |                          |
| the continued transition to the  |        |                          |
| GMDSS, the experience since its  |        |                          |
| introduction, and the needs of   |        |                          |
| all classes of ships             |        |                          |
+----------------------------------+--------+--------------------------+
| **Authors:**                     |        |                          |
|                                  |        |                          |
| Joe Hersey, USCG                 |        |                          |
|                                  |        |                          |
| Tel: (202) 475-3550              |        |                          |
|                                  |        |                          |
| Email: <joe.hersey@uscg.mil>     |        |                          |
+----------------------------------+--------+--------------------------+
| **Purpose:** To propose          |        |                          |
| modifications to the Radio       |        |                          |
| Regulations in regards to two    |        |                          |
| issues. Issue A -- Transition to |        |                          |
| GMDSS and Issue B -- New         |        |                          |
| technologies for maritime VHF    |        |                          |
+----------------------------------+--------+--------------------------+
| **Abstract: Issue A --           |        |                          |
| Transition to GMDSS**            |        |                          |
|                                  |        |                          |
| The 1991-1999 implementation of  |        |                          |
| the Global Maritime Distress and |        |                          |
| Safety System (GMDSS) was        |        |                          |
| expected to lead to the deletion |        |                          |
| of Appendix **13** and other     |        |                          |
| regulatory text concerning       |        |                          |
| systems which preceded GMDSS,    |        |                          |
| but experience of                |        |                          |
| Administrations has shown the    |        |                          |
| need to continue parts of those  |        |                          |
| systems, particularly those      |        |                          |
| related to the MF and VHF        |        |                          |
| radiotelephony distress, safety  |        |                          |
| and calling frequencies 2182 kHz |        |                          |
| and 156.8 MHz. With the loss of  |        |                          |
| radio officers and other         |        |                          |
| personnel on ship familiar with  |        |                          |
| radiocommunication procedures    |        |                          |
| and the advent of                |        |                          |
| radiocommunications equipment    |        |                          |
| equipped with microprocessors    |        |                          |
| and software, a need became      |        |                          |
| apparent to migrate as much of   |        |                          |
| the GMDSS procedures specified   |        |                          |
| in the Radio Regulations from    |        |                          |
| the responsibility of shipboard  |        |                          |
| personnel to the specifications  |        |                          |
| of the GMDSS radio equipment as  |        |                          |
| possible. That migration is      |        |                          |
| still incomplete. Regardless,    |        |                          |
| the text proposed here is        |        |                          |
| intended to be consistent with   |        |                          |
| that prepared by the Conference  |        |                          |
| Preparatory Meeting of 19        |        |                          |
| February to 2 March 2007.        |        |                          |
|                                  |        |                          |
| **Issue B -- New technologies    |        |                          |
| for maritime VHF**               |        |                          |
|                                  |        |                          |
| Resolution 342, titled "New      |        |                          |
| Technologies to provide improved |        |                          |
| efficiency in the use of the     |        |                          |
| band 156-174 MHz in the maritime |        |                          |
| mobile service", considers the   |        |                          |
| need for new maritime            |        |                          |
| technologies which use the bands |        |                          |
| described by Appendix **18** of  |        |                          |
| the Radio Regulations.           |        |                          |
| Considering k) of this           |        |                          |
| Resolution in particular         |        |                          |
| addresses the new Automatic      |        |                          |
| Identification System (AIS)      |        |                          |
| developed by ITU-R and the need  |        |                          |
| to provide full worldwide        |        |                          |
| interoperability of equipment on |        |                          |
| ships.                           |        |                          |
|                                  |        |                          |
| AIS is an international standard |        |                          |
| for ship-to-ship, ship-to-shore  |        |                          |
| and shore-to-ship communication  |        |                          |
| of information, including vessel |        |                          |
| position, speed, course,         |        |                          |
| destination and other data       |        |                          |
| defined by ITU-R Rec. M.1371-1.  |        |                          |
| AIS transmits on 161.975 MHz and |        |                          |
| 162.025 MHz, as specified by     |        |                          |
| Appendix **18** of the Radio     |        |                          |
| Regulations and by Rec. ITU-R    |        |                          |
| M.1371-1. AIS was originally     |        |                          |
| designed to enhance navigation   |        |                          |
| safety, but its potential as a   |        |                          |
| prime contributor to security    |        |                          |
| quickly became apparent. AIS     |        |                          |
| provides an effective means to   |        |                          |
| monitor the total global marine  |        |                          |
| environment that could affect    |        |                          |
| the security, safety, economy,   |        |                          |
| or environment of an             |        |                          |
| Administration.                  |        |                          |
|                                  |        |                          |
| On December 6, 2000, the         |        |                          |
| International Maritime           |        |                          |
| Organization (IMO) amended       |        |                          |
| Chapter V of the Safety of Life  |        |                          |
| at Sea (SOLAS) Convention to     |        |                          |
| include an implementation        |        |                          |
| schedule for shipboard AIS       |        |                          |
| carriage requirements. In 2002,  |        |                          |
| in response to the needs of      |        |                          |
| Administrations to improve their |        |                          |
| security, the IMO accelerated    |        |                          |
| the AIS carriage requirements    |        |                          |
| schedule from a phased approach  |        |                          |
| ending in 2008 to require all    |        |                          |
| vessels over 300 gross tons on   |        |                          |
| international voyages to carry   |        |                          |
| AIS equipment by 31 December     |        |                          |
| 2004.                            |        |                          |
|                                  |        |                          |
| In order to locate and identify  |        |                          |
| vessels for security purposes    |        |                          |
| beyond VHF range of shore, the   |        |                          |
| United States has installed AIS  |        |                          |
| receivers on aircraft and on low |        |                          |
| earth orbit mobile satellite     |        |                          |
| platforms. Recommendation M.1371 |        |                          |
| is being amended to accommodate  |        |                          |
| AIS transmissions from aircraft  |        |                          |
| and aids to navigation stations. |        |                          |
| Satellite use is not currently   |        |                          |
| allocated in Article **5**.      |        |                          |
+----------------------------------+--------+--------------------------+
| **Fact Sheet Preparer**: Darlene |        |                          |
| Drazenovich                      |        |                          |
+----------------------------------+--------+--------------------------+

**United States of America**

# PROPOSAL FOR THE WORK OF THE CONFERENCE

## Agenda Item 1.14

to review the operational procedures and requirements of the Global
Maritime Distress and Safety System (GMDSS) and other related provisions
of the Radio Regulations, taking into account Resolutions **331
(Rev.WRC‑03)** and **342 (Rev.WRC‑2000)** and the continued transition
to the GMDSS, the experience since its introduction, and the needs of
all classes of ships;

**Background Information:**

**Issue A -- Transition to GMDSS**

The 1991-1999 implementation of the Global Maritime Distress and Safety
System (GMDSS) was expected to lead to the deletion of Appendix **13**
and other regulatory text concerning systems which preceded GMDSS, but
experience of Administrations has shown the need to continue parts of
those systems, particularly those related to the MF and VHF
radiotelephony distress, safety and calling frequencies 2182 kHz and
156.8 MHz. With the loss of radio officers and other personnel on ship
familiar with radiocommunication procedures and the advent of
radiocommunications equipment equipped with microprocessors and
software, a need became apparent to migrate as much of the GMDSS
procedures specified in the Radio Regulations from the responsibility of
shipboard personnel to the specifications of the GMDSS radio equipment
as possible. That migration is still incomplete. Regardless, the text
proposed here is intended to be consistent with that prepared by the
Conference Preparatory Meeting of 19 February to 2 March 2007.

**Issue B -- New technologies for maritime VHF**

Resolution 342, titled "New Technologies to provide improved efficiency
in the use of the band 156-174 MHz in the maritime mobile service",
considers the need for new maritime technologies which use the bands
described by Appendix **18** of the Radio Regulations. Considering k) of
this Resolution in particular addresses the new Automatic Identification
System (AIS) developed by ITU-R and the need to provide full worldwide
interoperability of equipment on ships.

AIS is an international standard for ship-to-ship, ship-to-shore and
shore-to-ship communication of information, including vessel position,
speed, course, destination and other data defined by ITU-R Rec.
M.1371-1. AIS transmits on 161.975 MHz and 162.025 MHz, as specified by
Appendix **18** of the Radio Regulations and by Rec. ITU-R M.1371-1. AIS
was originally designed to enhance navigation safety, but its potential
as a prime contributor to security quickly became apparent. AIS provides
an effective means to monitor the total global marine environment that
could affect the security, safety, economy, or environment of an
Administration.

On December 6, 2000, the International Maritime Organization (IMO)
amended Chapter V of the Safety of Life at Sea (SOLAS) Convention to
include an implementation schedule for shipboard AIS carriage
requirements. In 2002, in response to the needs of Administrations to
improve their security, the IMO accelerated the AIS carriage
requirements schedule from a phased approach ending in 2008 to require
all vessels over 300 gross tons on international voyages to carry AIS
equipment by 31 December 2004.

In order to locate and identify vessels for security purposes beyond VHF
range of shore, the United States has installed AIS receivers on
aircraft and on low earth orbit mobile satellite platforms.
Recommendation M.1371 is being amended to accommodate AIS transmissions
from aircraft and aids to navigation stations. Satellite use is not
currently allocated in Article **5**.

**Proposals**

ARTICLE 5

USA/ / 1 MOD

**5.79A** When establishing coast stations in the NAVTEX service on the
frequencies 490 kHz, 518 kHz and 4 209.5 kHz, administrations are
strongly recommended to coordinate the operating characteristics in
accordance with the procedures of the International Maritime
Organization (IMO) (see Resolution 339 (Rev.WRC-03)). (WRC‑07)

**Reasons**: Consequential to GMDSS implementation

USA/ / 2 MOD

**5.82** In the maritime mobile service, the frequency 490 kHz is, to be
used exclusively for the transmission by coast stations of navigational
and meteorological warnings and urgent information to ships, by means of
narrow-band direct-printing telegraphy. The conditions for use of the
frequency 490 kHz are prescribed in Articles **31** and **52**. In using
the band  415-495 kHz for the aeronautical radionavigation service,
administrations are requested to ensure that no harmful interference is
caused to the frequency 490 kHz.     (WRC-07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 3 MOD

**5.83** The frequency 500 kHz is an international distress and calling
frequency for Morse radiotelegraphy. The conditions for its use are
prescribed in Articles **31** and **52**.

**Reasons**: Consequential to GMDSS implementation

USA/ / 4 MOD

**5.84** The conditions for the use of the frequency 518 kHz by the
maritime mobile service are prescribed in Articles **31**
and **52**.     (WRC-07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 5 MOD

**5.108** The carrier frequency 2 182 kHz is an international distress
and calling frequency for radiotelephony. The conditions for the use of
the band 2 173.5-2 190.5 kHz are prescribed in Articles **31**
and **52**.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 6 MOD

**5.111** The carrier frequencies 2 182 kHz, 3 023 kHz, 5 680 kHz, 8 364
kHz and the frequencies 121.5 MHz, 156.525 MHz, 156.8 MHz and 243 MHz
may also be used, in accordance with the procedures in force for
terrestrial radiocommunication services, for search and rescue
operations concerning manned space vehicles. The conditions for the use
of the frequencies are prescribed in Article **31**.

The same applies to the frequencies 10 003 kHz, 14 993 kHz and 19 993
kHz, but in each of these cases emissions must be confined in a band of
 3 kHz about the frequency.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 7 MOD

**5.115** The carrier (reference) frequencies 3 023 kHz and 5 680 kHz
may also be used, in accordance with Article 31 by stations of the
maritime mobile service engaged in coordinated search and rescue
operations.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 8 MOD

130. The conditions for the use of the carrier frequencies 4* *125 kHz
     and 6* *215 kHz are prescribed in Articles **31** and **52**.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 9 MOD

**5.145** The conditions for the use of the carrier frequencies 8* *291
kHz, 12* *290 kHz and 16* *420 kHz are prescribed in Articles** 31**
and **52**.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 10 SUP

**5.199**

**Reasons:** Consequential to GMDSS implementation.

USA/ / 11 MOD

75.2-137.175 MHz

+----------------------+----------------------+-----------------------+
| Allocation to        |                      |                       |
| services             |                      |                       |
+----------------------+----------------------+-----------------------+
| Region 1             | Region 2             | Region 3              |
+----------------------+----------------------+-----------------------+
| ...                  |                      |                       |
+----------------------+----------------------+-----------------------+
| **117.975-137**      |                      |                       |
| AERONAUTICAL MOBILE  |                      |                       |
| (R)                  |                      |                       |
|                      |                      |                       |
| 5.111 5.198 5.199    |                      |                       |
| **MOD** 5.200 5.201  |                      |                       |
| 5.202 5.203 5.203A   |                      |                       |
| 5.203B               |                      |                       |
+----------------------+----------------------+-----------------------+

**Reasons**: Consequential to GMDSS implementation; editorial.

USA/ / 12 MOD

**5.200** In the band 117.975-137 MHz, the frequency 121.5 MHz is the
aeronautical emergency frequency and, where required, the frequency
123.1 MHz is the aeronautical frequency auxiliary to 121.5 MHz. Mobile
stations of the maritime mobile service may communicate on these
frequencies under the conditions laid down in Article **31** for
distress and safety purposes with stations of the aeronautical mobile
service.

**Reasons**: Consequential to GMDSS implementation; editorial.

USA/ / 13 MOD

148-223 MHz

+----------------------+----------------------+-----------------------+
| Allocation to        |                      |                       |
| services             |                      |                       |
+----------------------+----------------------+-----------------------+
| Region 1             | Region 2             | Region 3              |
+----------------------+----------------------+-----------------------+
| **\....**            |                      |                       |
+----------------------+----------------------+-----------------------+
| **150.05-153**       | **150.05-156.5125**  |                       |
|                      |                      |                       |
| FIXED                | FIXED                |                       |
|                      |                      |                       |
| MOBILE except        | MOBILE               |                       |
| aeronautical\        |                      |                       |
| mobile               |                      |                       |
|                      |                      |                       |
| RADIO ASTRONOMY      |                      |                       |
|                      |                      |                       |
| 5.149                |                      |                       |
+----------------------+----------------------+-----------------------+
| **153-154**          |                      |                       |
|                      |                      |                       |
| FIXED                |                      |                       |
|                      |                      |                       |
| MOBILE except        |                      |                       |
| aeronautical\        |                      |                       |
| mobile (R)           |                      |                       |
|                      |                      |                       |
| Meteorological Aids  |                      |                       |
+----------------------+----------------------+-----------------------+
| **154-156.5125**     |                      |                       |
|                      |                      |                       |
| FIXED                |                      |                       |
|                      |                      |                       |
| MOBILE except        |                      |                       |
| aeronautical\        |                      |                       |
| mobile (R)           |                      |                       |
+----------------------+----------------------+-----------------------+
| 5.226                | 5.225 5.226          |                       |
+----------------------+----------------------+-----------------------+
| *                    |                      |                       |
| *156.5125-156.5375** |                      |                       |
| MARITIME MOBILE      |                      |                       |
| (distress and        |                      |                       |
| calling)             |                      |                       |
|                      |                      |                       |
| 5.111 5.226          |                      |                       |
+----------------------+----------------------+-----------------------+
| *                    | **156.5375-7625**    |                       |
| *156.5375-156.7625** |                      |                       |
|                      | FIXED                |                       |
| FIXED                |                      |                       |
|                      | MOBILE               |                       |
| MOBILE except        |                      |                       |
| aeronautical\        |                      |                       |
| mobile               |                      |                       |
+----------------------+----------------------+-----------------------+
| 5.226                | 5.225 5.226          |                       |
+----------------------+----------------------+-----------------------+
| *                    |                      |                       |
| *156.7625-156.8375** |                      |                       |
| MARITIME MOBILE      |                      |                       |
| (distress and        |                      |                       |
| calling)             |                      |                       |
|                      |                      |                       |
| 5.111 5.226          |                      |                       |
+----------------------+----------------------+-----------------------+
| **156.8375-174**     | **156.8375-174**     |                       |
|                      |                      |                       |
| FIXED                | FIXED                |                       |
|                      |                      |                       |
| MOBILE except        | MOBILE               |                       |
| aeronautical\        |                      |                       |
| mobile               |                      |                       |
+----------------------+----------------------+-----------------------+
| 5.226 5.229 **ADD**  | 5.226 5.230 5.231    |                       |
| 5.AAA                | 5.232 **ADD** 5.AAA  |                       |
+----------------------+----------------------+-----------------------+

**Reasons: Consequential to GMDSS implementation. Reallocation of DSC
distress frequency 156.525 MHz does not include guardband. Therefore, it
is not necessary.**

USA/ / 14 MOD

**5.226** The frequency 156.8 MHz is the international distress, safety
and calling frequency for the maritime mobile VHF radiotelephone
service. The conditions for the use of this frequency are contained in
Article 31 and Appendix **18**.

The frequency 156.525 MHz is the international distress, safety and
calling frequency for the maritime mobile VHF radiotelephone service
using digital selective calling (DSC). The conditions for the use of
this frequency are contained in Articles **31** and **52**, and
Appendix 18.

In the bands 156-156.5125 MHz, 156.5375-156.7625 MHz, 156.8375-157.45
MHz, 160.6-160.975 MHz and 161.475-162.05 MHz, each administration shall
give priority to the maritime mobile service on only such frequencies as
are assigned to stations of the maritime mobile service by the
administration (see Articles **31** and **52**, and Appendix **18**).

Any use of frequencies in these bands by stations of other services to
which they are allocated should be avoided in areas where such use might
cause harmful interference to the maritime mobile VHF radiocommunication
service.

However, the frequency 156.8 MHz and the frequency bands in which
priority is given to the maritime mobile service may be used for
radiocommunications on inland waterways subject to agreement between
interested and affected administrations and taking into account current
frequency usage and existing agreements.

**Reasons**: Consequential to GMDSS implementation. Reallocation of DSC
distress frequency 156.525 MHz does not include guardband, not believe
to be necessary.

USA/ / 15 SUP

**5.227**

**Reasons**: Consequential to GMDSS implementation.

USA/ / 16 ADD

**5.AAA** The bands 161.9625-161.9875 MHz and 162.0125-162.0375 MHz are
also allocated to the mobile-satellite service (Earth-to-space) on a
secondary basis for the reception of the automatic identification system
(AIS) emissions.

**Reasons**: Consequential to GMDSS implementation. Allows for satellite
detection of AIS to allow administrations help ensure the safety and
security of ships and ports.

USA/ / 17 MOD

**5.256** The frequency 243 MHz is the frequency in this band for use by
survival craft stations and equipment used for survival purposes.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 18 MOD

**5.266** The use of the band 406-406.1 MHz by the mobile-satellite
service is limited to low power satellite emergency position-indicating
radiobeacons (see also Article **31**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 19 MOD

**5.287** In the maritime mobile service, the frequencies 457.525 MHz,
457.550 MHz, 457.575 MHz, 467.525 MHz, 467.550 MHz and 467.575 MHz may
be used by on-board communication stations. Where needed, equipment
designed for 12.5 kHz channel spacing using also the additional
frequencies 457.5375 MHz, 457.5625 MHz, 467.5375 MHz and 467.5625 MHz
may be introduced for on-board communications. The use of these
frequencies in territorial waters may be subject to the national
regulations of the administration concerned. The characteristics of the
equipment used shall conform to those specified in
Recommendation ITU‑R M.1174-2.     (WRC-07)

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 15

Interferences

Section I -- Interference from Radio Stations

USA/ / 20 MOD

**15.8** § 4 Special consideration shall be given to avoiding
interference on distress and safety frequencies, those related to
distress and safety identified in Article **31** and those related to
safety and regularity of flight identified in Appendix
**27**.     (WRC‑07)

**Reasons:** Consequential to GMDSS implementation.

USA/ / 21 MOD

**15.28** § 20 Recognizing that transmissions on distress and safety
frequencies and frequencies used for the safety and regularity of flight
(see Article **31** and Appendix **27**) require absolute international
protection and that the elimination of harmful interference to such
transmissions is imperative, administrations undertake to act
immediately when their attention is drawn to any such harmful
interference.     (WRC‑07)

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 19

Identification of stations

USA/ / 22 MOD

**19.55** § 24 1)

-- two characters and two letters, *or*

-- two characters, two letters and one digit (other than the digits 0
or 1), *or*

-- two characters (provided that the second is a letter) followed by
four digits (other than the digits 0 or 1 in cases where they
immediately follow a letter), *or*

-- two characters and one letter followed by four digits (other than the
digits 0 or 1 in cases where they immediately follow a letter).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 23 SUP

**19.56**

**Reasons**: Consequential to GMDSS implementation.

USA/ / 24 MOD

**19.76** 4) *Emergency position‑indicating radiobeacon stations*

When speech transmission is used:

-   the name and/or the call sign of the parent ship to which the
    radiobeacon belongs.

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 30

General provisions

USA/ / 25 MOD

**30.1** § 1 This Chapter contains the provisions for the operational
use of the global maritime distress and safety system (GMDSS). GMDSS
functional requirements, system elements and equipment carriage
requirements are set forth in the International Convention for the
Safety of Life at Sea (SOLAS), 1974, as amended. This Chapter also
contains provisions for initiating distress, urgency and safety
communications by means of radiotelephony on the frequency 156.8 MHz
(VHF channel 16).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 26 MOD

**30.3** § 3 No provision of these Regulations prevents the use by
stations on board aircraft, ships engaged in search and rescue
operations, land stations, or -earth stations, in exceptional
circumstances, of any means at their disposal to assist a mobile station
or a mobile earth station in distress (see also Nos. **4.9** and
**4.16**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 27 MOD

**30.4** § 4 The provisions specified in this Chapter are obligatory in
the maritime mobile service and the maritime mobile‑satellite service
for all stations using the frequencies and techniques prescribed for the
functions set out herein (see also No. **30.5**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 28 ADD

**30.11*bis ***Aircraft, when conducting search and rescue operations
are also permitted to operate DSC equipment on the VHF DSC frequency
156.525 MHz, and AIS equipment on the AIS frequencies 161.975 MHz and
162.025 MHz.

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 31

Frequencies for the global maritime distress and safety system (GMDSS)

USA/ / 29 MOD

**31.1** § 1 The frequencies to be used for the transmission of distress
and safety infor­mation under the GMDSS are contained in Appendix **15**.
In addition to the frequencies listed in Appendix **15**, ship stations
and coast stations should use other appropriate frequencies for the
transmission of safety messages and general radiocommunications to and
from shore-based radio systems or networks.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 30 MOD

**31.2** § 2 Any emission causing harmful interference to distress and
safety communi­cations on any of the discrete frequencies identified in
Appendix **15** is prohibited.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 31 MOD

**31.17** § 8 1) Ship stations, where so equipped, shall, while at sea,
maintain an automatic digital selective calling watch on the appropriate
distress and safety calling frequencies in the frequency bands in which
they are operating. Ship stations, where so equipped, shall also
maintain watch on the appropriate frequencies for the automatic
reception of transmissions of meteorological and navigational warnings
and other urgent information to ships.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 32 [NOC]{.underline}

**31.18** 2) Ship stations complying with the provisions of this Chapter
should, where practicable, maintain a watch on the frequency 156.650 MHz
for communications related to the safety of navigation.

**Reasons:** The existing Radio Regulation provisions for the use of
Channel 13 (156.650 MHz) and adequate and necessary for intership
navigation. The high volume of safety and calling traffic on Channel 16
(156.8 MHz) in some locations make reliance on Channel 16 impractical
for that purpose. A internationally-common intership navigation channel
is still necessary for reasons of safety.

ARTICLE 32

Operational procedures for distress and safety communications in the
global\
maritime distress and safety system (GMDSS)

USA/ / 33 MOD

**32.1** § 1 Distress communications rely on the use of terrestrial MF,
HF and VHF radiocommunications and communications using satellite
techniques. Distress communications shall have absolute priority over
all other transmissions.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 34 MOD

**32.2** § 2 1) The distress alert (see No. **32.9**) shall be sent
through a satellite either with absolute priority in general
communication channels, on exclusive distress and safety frequencies
reserved for satellite EPIRBs in the Earth-to-space direction or on the
distress and safety frequencies designated in the MF, HF and VHF bands
(see Appendix **15**).

Reasons: Consequential to GMDSS implementation.

USA/ / 35 MOD

**32.4** § 3 All stations which receive a distress alert transmitted on
the distress and safety frequencies in the MF, HF and VHF bands shall
immediately cease any transmission capable of interfering with distress
traffic and prepare for subsequent distress traffic.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 36 MOD

**32.5** § 4 Calls using digital selective calling shall use the
technical structure and content set forth in Recommendations ITU-R
M.493-11 and ITU-R M.541-9.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 37 ADD

**32.10B** Administrations shall take practicable and necessary steps to
ensure the avoidance of false distress alerts, including those
transmitted inadvertently.

**Reasons**: Consequential to GMDSS implementation. False distress
alerts, particularly those generated by automated equipment such as the
GMDSS, are a burden for rescue coordination centers and those having
search and rescue responsibility.

USA/ / 38 MOD

**32.13** § 9 1) Ship-to-ship distress alerts are used to alert other
ships in the vicinity of the ship in distress and are based on the use
of digital selective calling in the VHF and MF bands. Additionally, the
HF band may be used.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 39 ADD

**32.13A** 2) In order to attract attention from as many ship stations
as possible, ship stations equipped for making use of digital selective
calling procedures may transmit a radiotelephony distress call and
message on the frequency 156.8 MHz (VHF channel 16) immediately
following the distress alert sent by digital selective calling on the
frequency 156.525 MHz (VHF channel 70).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 40 ADD

**32.13B** 3) Ship stations not equipped for making use of the digital
selective calling procedures may initiate the distress communications by
transmitting a radiotelephony distress call and message on the frequency
156.8 MHz (VHF channel 16). The radiotelephone distress procedure
consists of the distress call and the distress message[^1].

**Reasons**: Consequential to GMDSS implementation.

USA/ / 41 ADD

**32.13C** § 9A 1) The distress call sent on the frequency 156.8 MHz
(VHF channel 16) shall be given in the following form:

-- the distress signal MAYDAY, spoken three times;

-- the words THIS IS;

-- the name of the vessel in distress, spoken three times;

-- the call sign or other identification;

-   the MMSI (if the initial alert has been sent by DSC).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 42 ADD

**32.13D** 2) The distress message which follows the distress call,
shall be given in the following form:

-- the distress signal MAYDAY;

-- the name of the vessel in distress;

-- the call sign or other identification;

-- the MMSI (if the initial alert has been sent by DSC);

-- the position given as the latitude and longitude, or if latitude and
longitude is not known, with respect to a known geographical location;

-- the nature of the distress;

-- the kind of assistance required;

-   any other useful information.

**Reasons**: Consequential to GMDSS implementation. The fifth bullet was
revised from the CPM text to emphasize the importance of latitude and
longitude by search and rescue authorities.

USA/ / 43 ADD

**32.13E** § 9B Digital selective calling procedures use a combination
of automated functions and manual intervention to generate the
appropriate distress call format in the most recent version of
Recommendation ITU‑R M.541. The distress alert sent by digital selective
calling consists of one or more distress alert attempts in which a
message format is transmitted identifying the station in distress,
giving its last recorded position and, if entered, the nature of the
distress. At MF and HF, distress alert attempts may be sent as a single
frequency attempt or a multi-frequency attempt on up to six frequencies
within one minute. At VHF, only single frequency call attempts are used.
The distress alert will repeat automatically at random intervals, a few
minutes apart, until an acknowledgement sent by digital selective
calling is received.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 44 MOD

**32.15** 2) The distress alert relay shall contain the identification
of the mobile unit in distress, its position and all other information
which might facilitate rescue.

B3 -- Transmission of a distress alert relay by a station not itself in
distress

**Reasons**: Consequential to GMDSS implementation.

USA/ / 45 MOD

**32.16** § 11 A station in the mobile or mobile-satellite service which
learns that a mobile unit is in distress (for example, by a radio call
or by observation) shall initiate and transmit a distress alert relay on
behalf of the mobile unit in distress once it has ascertained that any
of the following circumstances apply:

**Reasons**: Consequential to GMDSS implementation.

USA/ / 46 MOD

**32.17** *a)* on receiving a distress call sent by radiotelephony on
the frequency 156.8 MHz (VHF channel 16), which is not acknowledged by a
coast station or another vessel within 5 minutes (see also
No.** 32.29A)**;

**Reasons**: Consequential to GMDSS implementation.

USA/ / 47 MOD

**32.17A** *b)* on receiving a distress alert on an HF channel, which is
not acknowledged by a coast station within 5 minutes (see also
No.** 32.31**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 48 MOD

**32.18** *c)* on knowing that the mobile unit in distress is otherwise
unable or incapable of participating in distress communications and the
master or other person responsible for the mobile unit not in distress
considers that further help is necessary.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 49 MOD

**32.19** § 12 1) The distress relay on behalf of a mobile unit in
distress shall be sent in a form appropriate to the circumstances using
either a MAYDAY relay by radiotelephony (see No.** 32.19E**), an
individually addressed distress relay call by digital selective calling
(see No.** 32.19B**) or a distress priority message through a ship earth
station.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 50 ADD

**32.19A** 2) A station transmitting a distress alert relay in
accordance with Nos. **32.16** to **32.18** shall indicate that it is
not itself in distress.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 51 ADD

**32.19B** 3) A distress alert relay sent by digital selective calling
should use the call format, as found in the most recent version of
Recommendations ITU‑R M.493 and ITU‑R M.541 and preferably be addressed
to an individual coast station or rescue coordination centre^new^.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 52 ADD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^new^ **32.19B.1** Vessels making a distress relay call should ensure
that a suitable coast station or rescue coordination centre is informed
of any original distress communications.

USA/ / 53 ADD

**32.19C** 4) However, a ship shall not transmit a distress relay alert
to all ships by digital selective calling on the VHF or MF distress
frequencies following receipt of a distress alert sent by digital
selective calling by the ship in distress.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 54 ADD

**32.19D** 5) When an aural watch is being maintained on shore and
reliable ship-to-shore communications can be established by
radiotelephony, a distress relay call shall be sent by radiotelephony
and addressed to the relevant coast station or rescue coordination
centre^new^ on the appropriate frequency.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 55 ADD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^new^ **32.19D.1** Vessels making a distress relay call should ensure
that a suitable coast station or rescue coordination centre is informed
of any original distress communications.

Reasons: Consequential to GMDSS implementation.

USA/ / 56 ADD

**32.19E** 6) The distress relay call sent by radiotelephony shall be
given in the following form:

-- the distress signal MAYDAY RELAY, spoken three times;

-- ALL STATIONS or coast station name spoken three times;

-- the words THIS IS;

-- the name of the relaying station, spoken three times;

-- the call sign or other identification of the relaying station;

-   the MMSI (if the initial alert has been sent by DSC) of the relaying
    station (the vessel not in distress).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 57 ADD

**32.19F** 7) This call shall be followed by a distress message which
shall, as far as possible, repeat the information^new^ contained in the
original distress alert.

**Reasons:** Consequential to GMDSS implementation.

USA/ / 58 ADD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^new^ **32.19F.1** If the station in distress cannot be identified, then
it will be necessary to originate the distress message as well, using,
for example, terms such as "Unidentified trawler" or "Unidentified
helicopter" refer to the mobile unit in distress.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 59 ADD

**32.19G** 8) When no aural watch is being maintained on shore, or there
are other difficulties in establishing reliable ship-to-shore
communications by radiotelephony, an appropriate coast station or rescue
coordination centre may be contacted by sending an individual distress
relay call by digital selective calling addressed solely to that station
and using the appropriate call formats.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 60 ADD

**32.19H** 9) In the event of continued failure to contact a coast
station or rescue coordination centre directly then it may be
appropriate to send a MAYDAY relay by radiotelephony addressed to all
ships or to all ships in a certain geographical area. See also
No. **32.19C**.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 61 MOD

**32.21** § 13 1) Acknowledgement of receipt of a distress alert,
including a distress alert relay, shall be made in the manner
appropriate to the method of transmission of the alert and within the
time-scale appropriate to the role of the station in receipt of the
alert. Acknowledgement by satellite shall be sent immediately.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 62 ADD

**32.21A** 2) When acknowledging receipt of a distress alert sent by
digital selective calling^5new4^, the acknowledgement in the terrestrial
services shall be made by digital selective calling, radiotelephony or
narrow-band direct-printing telegraphy as appropriate to the
circumstances, on the associated distress and safety frequency in the
same band in which the distress alert was received, taking due account
of the directions given in the most recent versions of Recommendations
ITU‑R M.493 and ITU‑R M.541.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 63 ADD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^new4^ **32.21A.1** In order to ensure that no unnecessary delay occurs
before the shore based authorities become aware of a distress incident,
the acknowledgement by digital selective calling to a distress alert
sent by digital selective calling shall normally only be made by a coast
station or a rescue coordination centre, as an acknowledgement by
digital selective calling will cancel any further automated repetition
of the distress alert using digital selective calling.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 64 ADD

**32.21B** Acknowledgement by digital selective calling in receipt of a
distress alert sent by digital selective calling addressed to stations
in the maritime mobile services shall be addressed to the same station
as the distress alert^5new5^.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 65 ADD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^new5^ **32.21B.1** In order to ensure that no unnecessary delay occurs
before the shore based authorities become aware of a distress incident,
the acknowledgement by digital selective calling to a distress alert
sent by digital selective calling shall normally only be made by a coast
station or rescue coordination centre, as an acknowledgement by digital
selective calling will cancel any further automated repetition of the
distress alert using digital selective calling.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 66 SUP

**32.22**

**Reasons**: Consequential to GMDSS implementation.

USA/ / 67 MOD

**32.23** § 15 1) When acknowledging by radiotelephony the receipt of a
distress alert from a ship station or a ship earth station, the
acknowledgement shall be given in the following form:

-- the distress signal MAYDAY;

-- the name followed by the call sign or the MMSI or other
identification of the station sending the distress message;

-- the words THIS IS;

-- the name and call sign or other identification of the station
acknowledging receipt;

-- the word RECEIVED;

-   the distress signal MAYDAY.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 68 MOD

**32.24** 2) When acknowledging by narrow-band direct printing
telegraphy the receipt of a distress alert from a ship station, the
acknowledgement shall be given in the following form:

-- the distress signal MAYDAY;

-- the call sign or other identification of the station sending the
distress alert;

-- the word DE;

-- the call sign or other identification of the station acknowledging
receipt of the distress alert;

-- the signal RRR;

-   the distress signal MAYDAY.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 69 SUP

**32.25**

**Reasons**: Consequential to GMDSS implementation.

USA/ / 70 MOD

**32.26** § 17 Coast stations and the appropriate coast earth stations
in receipt of distress alerts shall ensure that they are routed as soon
as possible to a rescue coordination centre. In addition receipt of a
distress alert is to be acknowledged as soon as possible by a coast
station, or by a rescue coordination centre via a coast station or an
appropriate coast earth station. A shore-to-ship distress alert relay
(see Nos. **32.14** and **32.15**) shall also be made when the method of
receipt warrants a broadcast alert to shipping or when the circumstances
of the distress incident indicate that further help is necessary.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 71 MOD

**32.27** § 18 A coast station using digital selective calling to
acknowledge a distress alert shall transmit the acknowledgement on the
distress calling frequency on which the alert was received and should
address it to all ships. The acknowledgement shall include the
identification of the ship whose distress alert is being acknowledged.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 72 MOD

**32.29** 2) In areas where reliable communications with one or more
coast stations are practicable, ship stations in receipt of a distress
alert from another vessel should defer acknowledgement for a short
interval so that a coast station may acknowledge receipt in the first
instance.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 73 ADD

**32.29A** 3) Ship stations in receipt of a distress call sent by
radiotelephony on the frequency 156.8 MHz (VHF channel 16) shall, if the
call is not acknowledged by a coast station or another vessel within 5
minutes, acknowledge receipt to the vessel in distress and use any means
available to relay the distress alert to an appropriate coast station or
coast earth station (see also Nos. **32.16** to **32.19F**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 74 MOD

**32.30** § 20 1) Ship stations operating in areas where reliable
communications with a coast station are not practicable which receive a
distress alert from a ship station which is, beyond doubt, in their
vicinity, shall, as soon as possible and if appropriately equipped,
acknowledge receipt to the vessel in distress and inform a rescue
coordination centre through a coast station or coast earth station (see
also Nos. **32.16** to **32.19H**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 75 MOD

**32.31** 2) However, in order to avoid making unnecessary or confusing
transmissions in response a ship station receiving an HF distress alert,
which may be at a considerable distance from the incident, shall not
acknowledge it but shall observe the provisions of Nos. **32.36** to
**32.38**, and shall, if the alert is not acknowledged by a coast
station within 5 minutes, relay the distress alert, but only to an
appropriate coast station or coast earth station (see also Nos.
**32.16** to **32.19H**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 76 MOD

**32.32** § 21 A ship station acknowledging receipt of a distress alert
sent by digital selective calling should, in accordance with
No. **32.29** or No. **32.30**:

**32.33** *a)* in the first instance, acknowledge receipt of the alert
by using radiotelephony on the distress and safety traffic frequency in
the band used for the alert, taking into account any potential
instructions issued by a responding coast station;

**Reasons**: Consequential to GMDSS implementation.

USA/ / 77 ADD

**32.34A** § 21A However, unless instructed to do so by a coast station
or a rescue coordination centre, a ship station may only send an
acknowledgement by digital selective calling in the event that:

*a)* no acknowledgement by digital selective calling from a coast
station has been observed; and

*b)* no other communication by radiotelephony or narrow-band
direct-printing telegraphy to or from the vessel in distress has been
observed; and

*c)* at least 5 minutes have elapsed and the distress alert by digital
selective calling has been repeated (see No. **32.21A.1**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 78 MOD

**32.45** § 28 1) The rescue coordination centre responsible for
controlling a search and rescue operation shall also coordinate the
distress traffic relating to the incident or may appoint another station
to do so.

Reasons: Consequential to GMDSS implementation.

USA/ / 79 MOD

**32.51** § 31 When distress traffic has ceased on frequencies which
have been used for distress traffic, the station controlling the search
and rescue operation shall initiate a message for transmission on these
frequencies indicating that distress traffic has finished.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 80 MOD

**32.52** § 32 1) In radiotelephony, the message referred to in
No. **32.51** consists of:

-- the distress signal MAYDAY;

-- the call "ALL STATIONS", spoken three times;

-- the words THIS IS;

-- the name of the station sending the message, spoken three times;

-- the call sign or other identification of the station sending the
message;

-- the time of handing in of the message;

-- the MMSI (if the initial alert has been sent by DSC), the name and
the call sign of the mobile station which was in distress; and

-   the words SEELONCE FEENEE pronounced as the French words "silence
    fini".

**Reasons**: Consequential to GMDSS implementation.

USA/ / 81 ADD

**32.53A** Cancellation of an inadvertent distress alert.

A station transmitting an inadvertent distress alert shall cancel the
distress alert.

Immediately cancel the distress alert orally on the associated distress
and safety frequency in the same band on which the "distress alert" was
transmitted using the following procedure:

-- All Stations All Stations All Stations;

-- the words THIS IS;

-- the name of the vessel, spoken three times;

-- the call sign or other identification;

-- the MMSI (if the initial alert has been sent by DSC);

-- PLEASE CANCEL MY FALSE DISTRESS ALERT of time in UTC.

Monitor the same band on which the "distress alert" was transmitted and
respond to any communications concerning that distress alert as
appropriate.

If the initial alert has been sent by DSC, if the DSC equipment is
capable, initiate a SELF CANCELLATION.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 82 MOD

**32.63** 3) Locating signals may be transmitted in the following
frequency bands:

117.975-137 MHz;

156-174 MHz;

406-406.1 MHz; and

9 200-9 500 MHz.

**Reasons**: Consequential to GMDSS implementation; editorial.

USA/ / 83 SUP

**32.64**

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 33

Operational procedures for urgency and safety communications in\
the global maritime distress and safety system (GMDSS)

USA/ / 84 MOD

**33.1** § 1 1) Urgency and safety communications include:

**Reasons**: Consequential to GMDSS implementation.

USA/ / 85 **ADD**

**33.7A** 2) Urgency communications shall have priority over all other
communications, except distress.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 86 **ADD**

**33.7B** 3) Safety communications shall have priority over all other
communications, except distress and urgency.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 87 MOD

**33.8** § 2 1) In a terrestrial system, urgency communications consist
of an announcement, transmitted using digital selective calling or
radiotelephony, followed by the urgency message transmitted using
radiotelephony or data. The announcement of the urgency message shall be
made on one or more of the distress and safety calling frequencies
specified in Section I of Article **31** using either digital selective
calling techniques and the urgency call format or, when appropriate,
radiotelephony procedures and the urgency signal. Calls using digital
selective calling should use the technical structure and content set
forth in the most recent version of Recommendations ITU-R M.493 and
ITU-R M.541..

**Reasons**: Consequential to GMDSS implementation. "Data" replaces
"narrow-band direct printing" to avoid restricting technology and
recognize the discontinuance of narrow-band direct printing by many
administrations.

USA/ / 88 ADD

**33.8A** 2) Ship stations not equipped for making use of digital
selective calling procedures may announce an urgency message by
transmitting the urgency signal by radiotelephony on the frequency 156.8
MHz (channel 16)^32.8A.1^ , while taking into account that other
stations outside VHF range may not receive the announcement.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 89 ADD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**33.8A.1** It should be noted that there is a higher probability of
successful reception of an urgency message if it is announced by DSC.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 90 ADD

**33.8B** 3) In the maritime mobile service, urgency communications may
be addressed either to all stations or to a particular station. When
using digital selective calling techniques, the urgency announcement
shall indicate which frequency is to be used to send the subsequent
message and, in the case of a message to all stations, shall use the
"All Ships" format setting.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 91 ADD

**33.8C** 4) Urgency communications from a coast station may also be
directed to a group of vessels or to vessels in a defined geographical
area.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 92 MOD

**33.9** § 3 1) The urgency message shall be transmitted on one or more
of the distress and safety traffic frequencies specified in Section I of
Article **31**.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 93 ADD

**33.9A** 2) However, in the maritime mobile service, the message shall
be transmitted on a working frequency:

*a)* in the case of a long message or a medical call; or

*b)* in areas of heavy traffic when the message is being repeated.

An indication to this effect shall be included in the announcement.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 94 ADD

**33.9B** 3) In the maritime mobile-satellite service, a separate
announcement does not need to be made before sending the urgency
message. However, if available, the appropriate network priority access
settings should be used for sending the message.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 95 MOD

**33.11** § 5 1) The urgency call format and the urgency signal indicate
that the calling station has a very urgent message to transmit
concerning the safety of a mobile unit or a person.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 96 ADD

**33.11A** 2) Communications concerning medical advice may be preceded
by the urgency signal. Mobile stations requiring medical advice may
obtain it through any of the land stations shown in the List of
Radiodetermination and Special Service Stations.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 97 ADD

**33.11B** 3) Urgency communications to support search and rescue
operations need not be preceded by the urgency signal.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 98 MOD

**33.12** § 6 1) The urgency call consists of:

-- the urgency signal PAN PAN, spoken three times;

-- the name of the called station or "all stations", spoken three times;

-- the words THIS IS;

-- the name of the station transmitting the urgency message, spoken
three times;

-- the call sign or any other identification;

-- the MMSI (if the initial announcement has been sent by DSC).

Followed by the message or followed by the details of the channel to be
used for the message in the case where a working channel is to be used.

In radiotelephony, on the selected working frequency, the urgency call
and message consists of:

-- the urgency signal PAN PAN, spoken three times;

-- the name of the called station or "all stations", spoken three times;

-- the words THIS IS;

-- the name of the station transmitting the urgency message, spoken
three times;

-- the call sign or any other identification;

-- the MMSI (if the initial announcement has been sent by DSC):

-   the text of the urgency message.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 99 MOD

**33.14** § 7 1) The urgency call format or urgency signal shall be sent
only on the authority of the person responsible for the ship, aircraft
or other vehicle carrying the mobile station or the mobile earth
station.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 100 ADD

**33.15A** § 7A 1) Ship stations in receipt of an urgency announcement
or call addressed to all stations shall not acknowledge.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 101 ADD

**33.15B** 2) Ship stations in receipt of an urgency announcement or
call of an urgency message shall monitor the frequency or channel
indicated for the message for at least five minutes. If, at the end of
the five minute monitoring period, no urgency message has been received,
a coast station should, if possible, be notified of the missing message.
Thereafter, normal working may be resumed.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 102 ADD

**33.15C** 3) Coast and ship stations which are in communication on
frequencies other than those used for the transmission of the urgency
signal or the subsequent message may continue their normal work without
interruption, provided that the urgency message is not addressed to them
nor broadcast to all stations.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 103 MOD

**33.16** § 8 The urgency cancellation consists of:

The urgency cancellation consists of:

-- the urgency signal PAN PAN, spoken three times;

-- "all stations", spoken three times;

-- the words THIS IS;

-- the name of the station transmitting the urgency message, spoken
three times;

-- the call sign or any other identification;

-- the MMSI (if the initial announcement has been sent by DSC):

-   PLEASE CANCEL MY URGENCY MESSAGE of time in UTC.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 104 MOD

**33.20** § 11 1) For the purpose of announcing and identifying medical
transports which are protected under the above-mentioned Conventions,
the procedure of Section II of Article **31** is used. The urgency
signal shall be followed by the addition of the single word MEDICAL in
narrow-band direct-printing and by the addition of the single word
MAY-DEE-CAL pronounced as in French "médical", in radiotelephony.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 105 **ADD**

**33.20A** 2) When using digital selective calling techniques, the
announcement on the appropriate Digital Selective Calling distress and
safety frequencies shall always use the following call format:

-- Format Specifier: "ALL SHIPS" on VHF, and geographical area on HF and
MF;

-- Category: "URGENCY";

-   Telecommand: "MEDICAL TRANSPORT".

**Reasons**: Consequential to GMDSS implementation.

USA/ / 106 **ADD**

**33.20B** 3) Medical transports may use one or more of the distress and
safety traffic frequencies specified in Section I of Article **31** for
the purpose of self-identification and to establish communications. As
soon as practicable, communications shall be transferred to an
appropriate working frequency.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 107 MOD

**33.21** § 12 The use of the signals described in Nos. **33.20** and
**33.20A** indicates that the message which follows concerns a protected
medical transport. The message shall convey the following data:

**Reasons**: Consequential to GMDSS implementation.

USA/ / 108 SUP

**33.28 to 33.29**

**Reasons**: Consequential to GMDSS implementation.

USA/ / 109 MOD

**33.31** § 15 1) In a terrestrial system, safety communications consist
of an announcement, transmitted using digital selective calling or
radiotelephony, followed by the safety message transmitted using
radiotelephony or narrow-band direct printing. The announcement of the
safety message shall be made on one or more of the distress and safety
calling frequencies specified in Section I of Article **31** using
either digital selective calling techniques and the safety call format
or radiotelephony procedures and the safety signal.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 110 MOD

**33.31A** 2) However, in order to avoid unnecessary loading of the
distress and safety calling frequencies specified for use with digital
selective calling techniques:

a\) safety messages transmitted by coast stations in accordance with a
predefined timetable should not be announced by digital selective
calling techniques;

b\) the radiotelephony procedures for announcing the transmission of a
safety message should also be used when the message only concerns
vessels sailing in the immediate area.     (WRC‑07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 111 ADD

**33.31B** 3) In addition, ship stations not equipped for making use of
digital selective calling procedures may announce a safety message by
transmitting the safety signal by radiotelephony In such cases the
announcement shall be made using the frequency 156.8 MHz (VHF channel
16), while taking into account that other stations outside VHF range may
not receive the announcement.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 112 **ADD**

**33.31C** 4) In the maritime mobile service, safety messages shall
generally be addressed to all stations. In some cases, however, they may
be addressed to a particular station. When using digital selective
calling techniques, the safety announcement shall indicate which
frequency is to be used to send the subsequent message and, in the case
of a message to all stations, shall use the "All Ships" format setting.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 113 MOD

**33.32** § 16 1) In the maritime mobile service, the safety message
shall, where practicable, be transmitted on a working frequency in the
same band(s) as used for the announcement. A suitable indication to this
effect shall be made at the end of the announcement. In the case that no
other option is practicable, the safety message may be sent by
radiotelephony on the frequency 156.8 MHz (VHF channel 16).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 114 ADD

**33.32A** 2) In the maritime mobile-satellite service, a separate
announcement does not need to be made before sending the safety message.
However, if available, the appropriate network priority access settings
should be used for sending the message.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 115 MOD

**33.34** § 18 1) The safety call format or the safety signal indicates
that the calling station has an important navigational or meteorological
warning to transmit.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 116 ADD

**33.34A** 2) Messages from ship stations containing information
concerning the presence of cyclones shall be transmitted, with the least
possible delay, to other mobile stations in the vicinity and to the
appropriate authorities through a coast station, or through a rescue
coordination centre via a coast station or an appropriate coast earth
station. These transmissions shall be preceded by the safety signal.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 117 ADD

**33.34B** 3) Messages from ship stations containing information on the
presence of dangerous ice, dangerous wrecks, or any other imminent
danger to marine navigation, shall be transmitted as soon as possible to
other ships in the vicinity, and to the appropriate authorities through
a coast station, or through a rescue coordination centre via a coast
station or an appropriate coast earth station. These transmissions shall
be preceded by the safety signal.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 118 MOD

**33.35** § 19 1) The complete safety call consists of:

-- the safety signal SÉCURITÉ, spoken three times;

-- the name of the called station or "all stations", spoken three times;

-- the words THIS IS;

-- the name of the station transmitting the safety message, spoken three
times;

-- the call sign or any other identification;

-- the MMSI (if the initial announcement has been sent by DSC);

Followed by the safety message or followed by the details of the channel
to be used for the message in the case where a working channel is to be
used.

In radiotelephony, on the selected working frequency, the safety call
and message consists of:

-- the safety signal SÉCURITÉ, spoken three times;

-- the name of the called station or "all stations", spoken three times;

-- the words THIS IS

-- the name of the station transmitting the safety message, spoken three
times;

-- the call sign or any other identification;

-- the MMSI (if the initial alert has been sent by DSC);

-   the text of the safety message.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 119 ADD

**33.38A** § 20*bis* 1) Ship stations in receipt of a safety
announcement using digital selective calling techniques and the "All
Ships" format setting, or otherwise addressed to all stations shall not
acknowledge.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 120 ADD

**33.38B** 2) Ship stations in receipt of an announcement of a safety
message shall monitor the frequency or channel indicated for the message
and shall listen until they are satisfied that the message is of no
concern to them. They shall not make any transmission likely to
interfere with the message.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 121 MOD

Section V -- Transmission of maritime safety information^MOD1^

**Reasons**: Consequential to GMDSS implementation.

USA/ / 122 MOD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^1^ **33.V.1** Maritime safety information includes navigation and
meteorological warnings, meteorological forecasts and other urgent
messages pertaining to safety transmitted from coast stations or coast
earth stations.

**Reasons:** Consequential to GMDSS implementation.

USA/ / 123 SUP

**33.39A** to **33.40**

**Reasons**: Consequential to GMDSS implementation.

USA/ / 124 MOD

Section VII -- Use of other frequencies for safety

**Reasons**: Consequential to GMDSS implementation.

USA/ / 125 MOD

**33.53** § 28 Radiocommunications for safety purposes concerning ship
reporting communications, communications relating to the navigation,
movements and needs of ships and weather observation messages may be
conducted on any appropriate communications frequency, including those
used for public correspondence. In terrestrial systems, the bands
between 415 kHz and 535 kHz (see Article **52**), 1 606.5 kHz and 4 000
kHz (see Article **52**), 4 000 kHz and 27500 kHz (see Appendix **17**)
and 156 MHz and 174 MHz (see Appendix **18**) are used for this
function. In the maritime mobile-satellite service, frequencies in the
bands 1 530-1 544 MHz and 1 626.5-1 645.5 MHz are used for this function
as well as for distress alerting purposes (see No. **32.2**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 126 SUP

**33.54 to 33.55**

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 34

Alerting signals in the global maritime distress and safety system
(GMDSS)

USA/ / 127 MOD

**34.1** § 1 The emergency position-indicating radiobeacon signal
transmitted on satellite EPIRB signals in the band 406-406.1 MHz
*  *shall be in accordance with relevant ITU-R Recommendations, to
include but not limited to Recommendation 604 (Rev.Mob-87).

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 41

Communications with stations in the maritime services

USA/ / 128 MOD

**41.1** Stations on board aircraft may communicate, for purposes of
distress, and for public correspondence^1^, with stations of the
maritime mobile or maritime mobile-satellite services. For these
purposes, they shall conform to the relevant provisions of
Chapter **VII** and Chapter **IX**, Articles **51** (Section III), **53,
54, 55, 57** and **58** (see also Nos. **4.19, 4.20** and** 43.4**).

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 47

Operator's certificates

USA/ / 129 MOD

**47.18** § 5 Each administration may determine the conditions under
which personnel holding certificates may be granted certificates
specified in Nos. **47.20** to **47.23**.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 130 MOD

Section IV -- Qualifying service (WRC‑07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 131 SUP

Reasons: Consequential to GMDSS implementation.

ARTICLE 51

Conditions to be observed in the maritime services

USA/ / 132 SUP

51.8 to 51.23

**Reasons**: Consequential to GMDSS implementation.

USA/ / 133 ADD

***51.8 Section B*** (SUP - WRC‑07)

***51.9 -- 51.23*** (SUP - WRC‑07)

**Reasons**: Consequential to the suppression of the record notes 51.8
through 51.23.

USA/ / 134 MOD

**51.53** *a)* send class J3E emissions on a carrier frequency of
2 182 kHz and receive class J3E emissions on a carrier frequency of
2 182 kHz, except for such apparatus as is referred to in No. **51.56**;

**Reasons**: Consequential to GMDSS implementation.

USA/ / 135 MOD

**51.58** § 23 All ship stations equipped with radiotelephony to work in
the authorized bands between 4* *000 kHz and 27* *500 kHz and which do
not comply with the provisions of Chapter** VII** should be able to send
and receive on the carrier frequencies 4* *125 kHz and 6* *215 kHz.
However, all ship stations which comply with the provisions of
Chapter** VII** shall be able to send and receive on the carrier
frequencies designated in Article** 31** for distress and safety traffic
by radiotelephony for the frequency bands in which they are operating.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 136 MOD

**51.79** 2) The frequency 156.3 MHz may be used by stations on board
aircraft for safety purposes. It may also be used for communication
between ship stations and stations on board aircraft engaged in
coordinated search and rescue operations (see Appendix **15**).

**Reasons**: Consequential to GMDSS implementation.

**51.80** 3) The frequency 156.8 MHz may be used by stations on board
aircraft for safety purposes only (see Appendix **15**).

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 52

Special rules relating to the use of frequencies

USA/ / 137 SUP

**Reasons:** Consequential to GMDSS implementation, remove current
Section II, record notes **52.16** through **52.93**.

USA/ / 138 MOD

Section II -- Use of frequencies for narrow-band direct-printing
telegraphy

**Reasons:** Consequential change due to the suppression of the current
Section II -- Use of frequencies for Morse radiotelegraphy.

USA/ / 139 MOD

**52.101** 2) Narrow-band direct-printing telegraphy is forbidden in the
band 2* *170-2* *194 kHz except as provided for in Appendix **15.**

**Reasons**: Consequential to the changes proposed for Appendix 15.

USA/ / 140 MOD

**52.183** § 86 1) Unless otherwise specified in the present Regulations
(see Nos. **51.53**, **52.188**, **52.189**, **and 52.199**), the class
of emission to be used in the bands between 1606.5 kHz and 4* *000 kHz
shall be J3E.      (WRC‑07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 141 MOD

**52.189** § 87 1) The frequency 2* *182 kHz^2^ is an international
distress frequency for radiotelephony.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 142 MOD

**52.209** 2) The carrier frequencies 2 045 kHz and 2 048 kHz shall not
be used for working between stations of the same nationality\*.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 143 MOD

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^4^ **52.221.2** The carrier frequencies 4 125 kHz and 6 215 kHz are
also authorized for common use by coast and ship stations for
single-sideband radiotelephony on a simplex basis for call and reply
purposes, provided that the peak envelope power of such stations does
not exceed 1 kW. The use of these frequencies for working purposes is
not permitted (see also No. **52.221.1**).

**Reasons**: Consequential to GMDSS implementation.

USA/ / 144 MOD

**52.231** § 101 1) The frequency 156.8 MHz is the international
frequency for distress traffic and for calling by radiotelephony when
using frequencies in the authorized bands between 156 MHz and 174 MHz.
The class of emission to be used for radiotelephony on the frequency
156.8 MHz shall be G3E (as specified in Recommendation ITU‑R M.489‑2).
     (WRC‑07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 145 MOD

**52.241** 9) The provisions of No. **52.240** do not apply to stations
in distress.

10\) The frequency 156.525 MHz is the international distress, safety and
calling frequency for the maritime mobile VHF radiotelephone service
using digital selective calling (DSC) when using frequencies in the
authorized bands between 156 MHz and 174 MHz.

11\) All emissions in the band 156.4875 - 156.5625 MHz capable of
causing harmful interference to the authorized transmissions of stations
of the maritime mobile service on 156.525 MHz are forbidden.

12\) To facilitate the reception of distress calls and distress traffic,
all transmissions on 156.525 MHz shall be kept to a minimum.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 146 MOD

**52.242** § 102 1) A coast station open to the international public
correspondence service should, during its hours of service, maintain
watch on its receiving frequency or frequencies indicated in the List of
Coast Stations.

**Reasons**: Consequential to GMDSS implementation.

ARTICLE 57

Radiotelephony

USA/ / 147 MOD

**57.1** § 1 The procedure detailed in Recommendation ITU‑R M.1171 shall
be applicable to radiotelephone stations, except in cases of distress,
urgency or safety.     (WRC‑07)

**Reasons**: Consequential to GMDSS implementation.

USA/ / 148 MOD

**57.8** § 4 Calling, and signals preparatory to traffic, shall not
exceed one minute when made on the carrier frequency 2 182 kHz or on
156.8 MHz, except in cases of distress, urgency or safety.

**Reasons**: Consequential to GMDSS implementation.

USA/ / 149 SUP

Appendix 13

**Reasons**: Consequential to GMDSS implementation.

USA/ / 150 MOD

APPENDIX 15 (Rev.WRC-07)

Frequencies for distress and safety communications for the Global\
Maritime Distress and Safety System (GMDSS)

(See Article **31**)

The frequencies for distress and safety communications for the GMDSS are
given in Tables 15‑1 and 15-2 for frequencies below and above 30 MHz,
respectively.

TABLE 15-1

Frequencies below 30 MHz

  ------------ -------------- -------------------------------------------------
  Frequency\   Description\   Notes
  (kHz)        of usage       

     490       MSI            The frequency 490 kHz is used exclusively for
                              maritime safety information (MSI).     (WRC-03)

     518       MSI            The frequency 518 kHz is used exclusively by the
                              international NAVTEX system.

  \*2 174.5    NBDP-COM       

  \*2 182      RTP-COM        The frequency 2 182 kHz uses class of emission
                              J3E. See also No. **52.190.**

  \*2 187.5    DSC            

   3 023       AERO-SAR       The aeronautical carrier (reference) frequencies
                              3 023 kHz and 5 680 kHz may be used for
                              intercommunication between mobile stations
                              engaged in coordinated search and rescue
                              operations, and for communication between these
                              stations and participating land stations, in
                              accordance with the provisions of Appendix **27**
                              (see Nos. **5.111** and **5.115**).

  \*4 125      RTP-COM        See also No. **52.221**. The carrier frequency
                              4 125 kHz may be used by aircraft stations to
                              communicate with stations of the maritime mobile
                              service for distress and safety purposes,
                              including search and rescue (see No. **30.11**).

  \*4 177.5    NBDP-COM       

  \*4 207.5    DSC            

   4 209.5     MSI            The frequency 4 209.5 kHz is exclusively used for
                              NAVTEX-type transmissions (see Resolution **339
                              (Rev.WRC-03)**).

   4 210       MSI-HF         

   5 680       AERO-SAR       See note under 3 023 kHz above.

  \*6 215      RTP-COM        See also No. **52.221**.

  \*6 268      NBDP-COM       

  \*6 312      DSC            
  ------------ -------------- -------------------------------------------------

TABLE 15-1 (*end *)

  ------------ ---------- -------------------------------------------------
   \*8 291     RTP-COM    

   \*8 376.5   NBDP-COM   

   \*8 414.5   DSC        

    8 416.5    MSI-HF     

  \*12 290     RTP-COM    

  \*12 520     NBDP-COM   

  \*12 577     DSC        

   12 579      MSI-HF     

  \*16 420     RTP-COM    

  \*16 695     NBDP-COM   

  \*16 804.5   DSC        

   16 806.5    MSI-HF     

   19 680.5    MSI-HF     

   22 376      MSI-HF     

   26 100.5    MSI-HF     
  ------------ ---------- -------------------------------------------------

TABLE 15-2

Frequencies above 30 MHz (VHF/UHF)

+---------+---------+-------------------------------------------------+
| Fre     | Desc    | Notes                                           |
| quency\ | ription |                                                 |
| (MHz)   | of      |                                                 |
|         | usage   |                                                 |
+---------+---------+-------------------------------------------------+
| \*121.5 | A       | The aeronautical emergency frequency 121.5 MHz  |
|         | ERO-SAR | is used for the purposes of distress and        |
|         |         | urgency for radiotelephony by stations of the   |
|         |         | aeronautical mobile service using frequencies   |
|         |         | in the band between 117.975 MHz and 137 MHz.    |
|         |         | This frequency may also be used for these       |
|         |         | purposes by survival craft stations. Emergency  |
|         |         | position-indicating radio beacons use the       |
|         |         | frequency 121.5 MHz as indicated in             |
|         |         | Recommendation ITU‑R M.690-1.                   |
|         |         |                                                 |
|         |         | Mobile stations of the maritime mobile service  |
|         |         | may communicate with stations of the            |
|         |         | aeronautical mobile service on the aeronautical |
|         |         | emergency frequency 121.5 MHz for the purposes  |
|         |         | of distress and urgency only, and on the        |
|         |         | aeronautical auxiliary frequency 123.1 MHz for  |
|         |         | coordinated search and rescue operations, using |
|         |         | class A3E emissions for both frequencies (see   |
|         |         | also Nos. 5.111 and 5.200). They shall then     |
|         |         | comply with any special arrangement between     |
|         |         | governments concerned by which the aeronautical |
|         |         | mobile service is regulated.                    |
+---------+---------+-------------------------------------------------+
| 123.1   | A       | The aeronautical auxiliary frequency 123.1 MHz, |
|         | ERO-SAR | which is auxiliary to the aeronautical          |
|         |         | emergency frequency 121.5 MHz, is for use by    |
|         |         | stations of the aeronautical mobile service and |
|         |         | by other mobile and land stations engaged in    |
|         |         | coordinated search and rescue operations (see   |
|         |         | also No. 5.200).                                |
|         |         |                                                 |
|         |         | Mobile stations of the maritime mobile service  |
|         |         | may communicate with stations of the            |
|         |         | aeronautical mobile service on the aeronautical |
|         |         | emergency frequency 121.5 MHz for the purposes  |
|         |         | of distress and urgency only, and on the        |
|         |         | aeronautical auxiliary frequency 123.1 MHz for  |
|         |         | coordinated search and rescue operations, using |
|         |         | class A3E emissions for both frequencies (see   |
|         |         | also Nos. 5.111 and 5.200). They shall then     |
|         |         | comply with any special arrangement between     |
|         |         | governments concerned by which the aeronautical |
|         |         | mobile service is regulated.                    |
+---------+---------+-------------------------------------------------+
| \*156.3 | V       | The frequency 156.3 MHz may be used for         |
|         | HF-CH06 | communication between ship stations and         |
|         |         | aircraft stations engaged in coordinated search |
|         |         | and rescue operations. It may also be used by   |
|         |         | aircraft stations to communicate with ship      |
|         |         | stations for other safety purposes (see also    |
|         |         | Note f ) in Appendix 18).                       |
+---------+---------+-------------------------------------------------+
| \*      | V       | The frequency 156.525 MHz is used in the        |
| 156.525 | HF-CH70 | maritime mobile service for distress and safety |
|         |         | calls using digital selective calling (see also |
|         |         | Nos. 4.9, 5.227, 30.2 and 30.3).                |
+---------+---------+-------------------------------------------------+
| \*      | V       | The frequency 156.650 MHz is used for           |
| 156.650 | HF-CH13 | ship-to-ship communications relating to the     |
|         |         | safety of navigation in accordance with Note k) |
|         |         | in Appendix 18.                                 |
+---------+---------+-------------------------------------------------+
| \*156.8 | V       | The frequency 156.8 MHz is used for distress    |
|         | HF-CH16 | and safety communications by radiotelephony     |
|         |         | Additionally, the frequency 156.8 MHz may be    |
|         |         | used by aircraft stations for safety purposes   |
|         |         | only.                                           |
+---------+---------+-------------------------------------------------+
| \*      | AIS 1   | This frequency 161.975 MHz is used for          |
| 161.975 |         | automatic identification system operation for   |
| MHz     |         | safety of navigation (see also Appendix 18).    |
+---------+---------+-------------------------------------------------+
| \*      | AIS 2   | This frequency 162.025 MHz is used for          |
| 162.025 |         | automatic identification system operation for   |
| MHz     |         | safety of navigation (see also Appendix 18).    |
+---------+---------+-------------------------------------------------+

TABLE 15-2 (*end *)

  ------------------- ----------- -------------------------------------------------
    \*406-406.1       406-EPIRB   This frequency band is used exclusively by
                                  satellite emergency position-indicating radio
                                  beacons in the Earth-to-space direction (see No.
                                  5.266).

   1 530-1 544        SAT-COM     In addition to its availability for routine
                                  non-safety purposes, the band 1 530-1 544 MHz is
                                  used for distress and safety purposes in the
                                  space-to-Earth direction in the maritime
                                  mobile-satellite service. GMDSS distress, urgency
                                  and safety communications have priority in this
                                  band (see No. 5.353A).

  \*1 544-1 545       D&S-OPS     Use of the band 1 544-1 545 MHz (space-to-Earth)
                                  is limited to distress and safety operations (see
                                  No. 5.356), including feeder links of satellites
                                  needed to relay the emissions of satellite
                                  emergency position-indicating radio beacons to
                                  earth stations and narrow-band (space-to-Earth)
                                  links from space stations to mobile stations.

  1 626.5-1 645.5     SAT-COM     In addition to its availability for routine
                                  non-safety purposes, the band 1 626.5-1 645.5 MHz
                                  is used for distress and safety purposes in the
                                  Earth-to-space direction in the maritime
                                  mobile-satellite service. GMDSS distress, urgency
                                  and safety communications have priority in this
                                  band (see No. 5.353A).

  \*1 645.5-1 646.5   D&S-OPS     Use of the band 1 645.5-1 646.5 MHz
                                  (Earth-to-space) is limited to distress and
                                  safety operations (see No. 5.375), including
                                  transmissions from satellite EPIRBs and relay of
                                  distress alerts received by satellites in low
                                  polar Earth orbits to geostationary satellites.

   9 200-9 500        SARTS       This frequency band is used by radar transponders
                                  to facilitate search and rescue.
  ------------------- ----------- -------------------------------------------------

Reasons: Consequential to GMDSS implementation. Automatic Identification
System (AIS) is also added due to its safety use and to the
International Maritime Organization Subcommittee on Communications and
Search and Rescue's decision to use AIS for locating purposes under the
GMDSS (AIS-SART). Asterisks added consequential to ship-to-ship safety
of navigation communications (Article 33.3), support communications for
search and rescue operations (Article 33.5), and communications relating
to the navigation, movements and needs of ships (Article 33.7) inclusion
as urgency and safety communications (Article 33.1).

APPENDIX 16

(See Articles **42** and **51**)

USA/ / 151 MOD

Section I -- Ship stations for which a Global Maritime Distress and
Safety System (GMDSS) installation is required by international
agreement

These stations shall be provided with:

1 the licence prescribed by Article **18**;

2 certificates of the operator or operators;

3 a log in which the following are recorded as they occur, together with
the time of the occurrence, unless administrations have adopted other
arrangements for recording all information which the log should contain:

*a)* a summary of communications relating to distress, urgency and
safety traffic;

*b)* a reference to important service incidents;

*c)* if the ship's rules permit, the position of the ship at least once
a day;

4 ITU Service Publications, in either printed or electronic format,
containing a List of MMSI stations and other operational information in
the Maritime Mobile Service (see Article **20**);

5 ITU Service Publications, in either printed or electronic format,
showing the details of Coast Stations and Coast Earth Stations with
which communications are likely to be conducted and a List of Coast
Stations and Coast Earth Stations providing navigational and
meteorological warnings and other urgent information for ships (see
Article **20**);

6 the relevant rules and procedures of radiocommunications, e.g. Manual
for Use by the Maritime Mobile and Maritime Mobile-Satellite Services
(paper or electronic format) (see Article **20**).

NOTE -- Administrations may, under appropriate circumstances exempt
ships from the carriage of the documents mentioned in items 4 to 6
above, or where equivalent publications with the same and similarly
updated content exist, notify the changed carrier requirement to the
Bureau which will make this publicly available.

**Reasons:** Consequential to GMDSS implementation. Provisions allowing
recreational vessels and other small vessels licensed by regulation to
travel between neighboring administrations by mutual agreement is also
included.

USA/ / 152 MOD

Section II -- Other ship stations for which a radio installation is
required

These stations shall be provided with:

1 the licence prescribed by Article **18**;

2 certificates of the operator or operators;

3 a log or other arrangements which the administration may have adopted
for that purpose, in which a summary of communications related to
distress, urgency and safety traffic shall be recorded together with the
time of their occurrence;

4 ITU Service Publications, in either printed or electronic format,
showing the details of Coast Stations with which communications are
likely to be conducted and a List of Coast Stations and Coast Earth
Stations providing navigational and meteorological warnings and other
urgent information for ships (see Article **20**);

5 the relevant rules and procedures of radiocommunications, e.g. Manual
for Use by the Maritime Mobile and Maritime Mobile-Satellite Services
(paper or electronic format) (see Article **20**).

NOTE -- Administrations may, under appropriate circumstances exempt
ships from the carriage of the documents mentioned in items 4 and 5
above, or where equivalent publications with the same and similarly
updated content exist, notify the changed carrier requirement to the
Bureau which will make this publicly available.

Section III -- Other ship stations

These stations shall be provided with:

1 the documents mentioned in items 1 and 2 of Section II;

2 the documents mentioned in items 4 and 5 of Section II, in accordance
with the requirements of the administrations concerned.

NOTE -- Administrations may, under appropriate circumstances exempt
ships from the carriage of the documents mentioned in item 2, or where
equivalent publications with the same and similarly updated content
exist, notify the changed carrier requirement to the Bureau which will
make this publicly available. Administrations may also under appropriate
circumstances and mutual agreement exempt ships travelling only between
their national jurisdictions from the carriage of the documents
mentioned in item 1, provided those vessels are licensed by regulation.

**Reasons:** Consequential to GMDSS implementation. Provisions allowing
recreational vessels and other small vessels licensed by regulation to
travel between neighboring administrations by mutual agreement is also
included.

USA/ / 153 SUP

**Reasons**: Consequential to GMDSS implementation

USA/ / 154 MOD

Section IV -- Stations on board aircraft

These stations shall be provided with:

1 the documents mentioned in items 1 and 2 of Section I;

2 a log, unless administrations have adopted other arrangements for
recording all information which the log should contain;

3 those published documents, in either printed or electronic formats,
containing official information relating to stations which the aircraft
station may use for the execution of its service.

**Reasons:** Consequential to GMDSS implementation. Provisions allowing
recreational vessels and other small vessels licensed by regulation to
travel between neighboring administrations by mutual agreement is also
included.

USA/ / 155 [NOC]{.underline}

Appendix 17 (R**ev**.WRC-03)\
\
Frequencies and channelling arrangements in the\
high-frequency bands for the maritime mobile service

(See Article **52**)

**Reasons**: This appendix should not be opened until evolving
requirements from the International Maritime Organization regarding HF
data in the GMDSS and electronic navigation (E-Nav) spectrum
requirements are identified, so that they can be accommodated.

USA/ / 156 SUP

Appendix 19

**Reasons**: Consequential to GMDSS implementation.

USA/ / 157 MOD

RESOLUTION 331 (Rev.WRC-07)

Transition to the Global Maritime Distress and Safety System (GMDSS)

The World Radiocommunication Conference (Geneva,
200~~3~~[7]{.underline}),

noting

that all ships subject to the International Convention for the Safety of
Life at Sea (SOLAS), 1974, as amended, are required to be fitted for the
Global Maritime Distress and Safety System (GMDSS),

noting further

*a)* that a number of administrations have taken steps to implement the
GMDSS also for classes of vessels not subject to SOLAS, 1974, as
amended;

*b)* that an increasing number of vessels not subject to SOLAS, 1974, as
amended, are making use of the techniques and frequencies of the GMDSS
prescribed in Chapter **VII**;

c\) that this Conference has amended Chapter VII to provide for
maintaining interoperability between ships fitted for the GMDSS and
ships not yet fully equipped for GMDSS;

*[d)]{.underline}* that there may be a need to maintain existing
shore-based distress and safety services for reception of distress,
urgency and safety calling by voice on VHF channel 16 for some years
after this Conference so that vessels not subject to SOLAS, 1974, as
amended and not yet using the techniques and frequencies of the GMDSS
will be able to attract attention and obtain assistance from these
services until such time as they are able to participate in the GMDSS;

*e)* that the International Maritime Organization (IMO) is of the view
that listening watch on VHF channel 16 by SOLAS ships, while at sea,
should be required and kept for a foreseeable future with a view to
providing:

-- a distress alerting and communication channel for non-SOLAS ships;
and

-- bridge-to-bridge communications, in cases where a watch is not
maintained on VHF channel 13;

*f)* that IMO has urged administrations to require all seagoing vessels
under national legislation, and encourage all vessels voluntarily
carrying VHF radio equipment to be fitted with facilities for
transmitting and receiving distress alerts by DSC on VHF channel 70;

*[g)]{.underline}* that the Radio Regulations require GMDSS ships to
keep watch on the appropriate digital selective calling (DSC) distress
frequencies;

*[h)]{.underline}* that separate provisions in the existing Radio
Regulations designate VHF channel 16 as the international channel for
general calling by radiotelephony;

*i)* that the Radio Regulations establish that ship stations should,
when practicable, keep watch on VHF channel 13;

*j)* that several administrations have established Vessel Traffic
Service (VTS) systems and require their vessels to keep watch on local
VTS channels;

*k)* that ships that are required by SOLAS to carry a radio station have
been equipped with DSC, and many vessels subject to national carriage
requirements are also being equipped with DSC, but the majority of many
vessels that carry a radio station on a voluntary basis might not yet
have DSC equipment;

*l)* that similarly, many administrations have established distress and
safety service based on DSC watchkeeping, but the majority of port
stations, pilot stations and other operational coast stations might not
yet have been equipped with DSC facilities;

*m)* that provisions **52.190** to **52.192** and **52.232** to
**52.234** allow 2 182 kHz and channel 16 to be used for call and reply,

considering

*a)* that personnel aboard ships may not be familiar with all of the
GMDSS provisions of the Radio Regulations or the complete functionality
of the GMDSS equipment carried onboard to meet regulatory requirements,
and other tasks may preclude them from becoming more knowledgeable,

*b)* that to be useful, GMDSS equipment must be simple to use;

recognizing

*a)* that as indicated in *noting further a), b), f), n)* and *l)* above
stations in the maritime mobile service are increasingly making use of
the frequencies and techniques of the GMDSS;

*b)* that this conference has adopted provisions for distress, urgency
and safety calling by radiotelephony on VHF channel 16 and requiring
ships, where practicable, to maintain watch on VHF channel 16;

*c)* the need to maintain existing shore-based distress and safety
services for reception of distress, urgency and safety calling by voice
on VHF channel 16 for some years after this Conference so that vessels
not subject to SOLAS, 1974, as amended and not yet using the techniques
and frequencies of the GMDSS will be able to attract attention and
obtain assistance from these services until such time as they are able
to participate in the GMDSS;

*d)* the need indicated in *noting further d)* above for maintaining
existing shore-based distress, urgency and safety services on VHF
channel 16,

*further recognizing*

The International Maritime Organization (IMO) and International
Organization of Marine Aids to Navigation and Lighthouse Authorities
(IALA) development of requirements integrating shipboard navigation and
communications, including GMDSS, into one system (E-Nav);

resolves

1 to retain the provisions permitting use of VHF channel 16 and the
frequency 2 182 kHz for general voice-calling;

2 to urge all administrations to assist in enhancing safety at sea by:

-- encouraging all vessels to make use of finalize the transition to the
GMDSS as soon as possible;

-- encouraging, where appropriate, establishment of suitable shore-based
facilities for GMDSS, either on an individual basis or in cooperation
with other relevant parties in the area;

-- encouraging all vessels carrying maritime VHF equipment to be fitted
with DSC on VHF channel 70 as soon as possible, taking into account the
relevant decisions of IMO;

-- encouraging vessels to limit their use of VHF channel 16 and the
frequency 2 182 kHz for calling to the minimum necessary, noting the
provisions of No. **52.239**;

3 that coast stations forming part of shore-based arrangements in the
area concerned for reception of distress calling by radiotelephony on
VHF channel 16 should maintain an efficient watch on VHF channel 16.
Such watch should be indicated in the List of Coast Stations.

4 that administrations may release their ship stations and coast
stations from the listening watch on VHF channel 16 [in respect of
distress, urgency and safety calling by voice, in accordance with
relevant decisions of IMO and ITU on aural watchkeeping requirements on
channel 16,]{.underline} taking into account of [the GMDSS radio systems
available in the area concerned;]{.underline}

when doing so, administrations should:

-- inform IMO of their decisions and submit to IMO details on the area
concerned;

-- inform the Secretary-General on the necessary details for inclusion
in the List of Coast Stations.

instructs the ITU-R

to monitor the development and changes to the GMDSS, in particular

-- watchkeeping requirements,

-- distress alerting,-- carriage requirements;

to update GMDSS technical recommendations where appropriate to transfer
as much GMDSS and related operational provisions into the required
equipment software as practical, simplifying the work of the operator,
ensuring its usefulness to the operator;

to include GMDSS publications and information in an easily accessible
integrated electronic display, designed to make essential information
available to the operator when it is most needed;

and report to a future world radiocommunication conference on when
further rationalization of Chapter **VII** should be considered,

resolves further

that the Secretary-General should ensure that such arrangements and
details regarding the area concerned be indicated in relevant maritime
publications,

instructs the Secretary-General

to bring this Resolution to the attention of IMO, the International
Civil Aviation Organization (ICAO) and the International Organization of
Marine Aids to Navigation and Lighthouse Authorities (IALA).

**Reasons**: Consequential to GMDSS implementation. The impact of the
loss of the dedicated radio operator and the need to simplify operation
of GMDSS equipment has also been added.

USA/ / 158 ADD

Resolution \[2 182 kHz\]

Distress and safety radiotelephony procedures for 2 182 kHz

The World Radiocommunication Conference (Geneva, 2007),

noting

a\) that all ships subject to the International Convention for the
Safety of Life at Sea (SOLAS), 1974, as amended, are required to be
fitted for the Global Maritime Distress and Safety System (GMDSS);

b\) that some vessels not subject to SOLAS, 1974, as amended, may not be
making use of the techniques and frequencies of the GMDSS prescribed in
Chapter **VII** and may wish to continue using radiotelephony procedures
for distress and safety communications on 2182 kHz until such time as
they are able to participate in the GMDSS;

c\) that some administrations may have a need to maintain shore-based
radiotelephony distress and safety services on 2182 kHz so that vessels
not subject to SOLAS, 1974, as amended and not yet using the techniques
and frequencies of the GMDSS will be able to obtain assistance from
these services until such time as they are able to participate in the
GMDSS,

considering

a\) that there needs to be some recognized guidance, for the use of
radiotelephony on 2182 kHz for distress and safety communications;

resolves

1 that ships, when in distress or when engaged in urgency or safety
related communications on 2 182 kHz, use the radiotelephony procedures
contained in the Annex to this Resolution;

2 that coast stations, in order to maintain communication with non-GMDSS
ships in distress or engaged in urgency or safety related communications
on 2 182 kHz, use the radiotelephony procedures contained in the Annex
to this Resolution.

Annex to Resolution \[2 182 kHz\]\
\
Distress and safety radiotelephony procedures for 2 182 kHz

Part A1 -- General

§ 1 The frequencies and techniques specified in this Resolution may be
used in the maritime mobile service for stations[^2] not required by
national or international regulation to fit GMDSS equipment and for
communications between those stations and aircraft. However, stations of
the maritime mobile service, when additionally fitted with any of the
equipment used by stations operating in conformity with the provisions
specified in Chapter** VII**, should, when using that equipment, comply
with the appropriate provisions of that Chapter.

§ 2 1) No provision of these Regulations prevents the use by a mobile
station or mobile earth station in distress of any means at its disposal
to attract attention, make known its position, and obtain help.

2\) No provision of these Regulations prevents the use by stations on
board aircraft or ships engaged in search and rescue operations, in
exceptional circumstances, of any means at their disposal to assist a
mobile station or mobile earth station in distress.

3\) No provision of these Regulations prevents the use by a land station
or coast earth station, in exceptional circumstances, of any means at
its disposal to assist a mobile station or mobile earth station in
distress (see also No.** 4.16**).

§ 3 In cases of distress, urgency or safety, transmissions by
radiotelephony should be made slowly and distinctly, each word being
clearly pronounced to facilitate transcription.

§ 4 The abbreviations and signals of Recommendation ITU‑R M.1172 and the
Phonetic Alphabet and Figure Code in Appendix** 14** should be used
where applicable[^3].

§ 5 Distress, urgency and safety transmissions may also be made using
digital selective calling and satellite techniques and/or
direct-printing telegraphy, in accordance with the provisions specified
in Chapter **VII** and relevant ITU-R Recommendations.

§ 6 Mobile stations[^4] of the maritime mobile service may communicate,
for safety purposes, with stations of the aeronautical mobile service.
Such communications shall normally be made on the frequencies
authorized, and under the conditions specified, in Section I of Part A2
(see also § 2 1)).

§ 6A Mobile stations of the aeronautical mobile service may communicate,
for distress and safety purposes, with stations of the maritime mobile
service in conformity with the provisions of this Resolution.

§ 7 Any aircraft required by national or international regulations to
communicate for distress, urgency or safety purposes with stations of
the maritime mobile service shall be capable of transmitting and
receiving class J3E emissions when using the carrier frequency 2 182 kHz
or the carrier frequency 4 125.

Part A2 -- Frequencies for distress and safety

Section I -- Availability of frequencies

A -- 2 182 kHz

§ 1 1) The carrier frequency 2* *182 kHz is an international distress
frequency for radiotelephony; it may be used by ship, aircraft and
survival craft stations when requesting assistance from the maritime
services. It is used for distress calls and distress traffic, for the
urgency signal and urgency messages and for the safety signal. Safety
messages should be transmitted, when practicable, on a working frequency
after a preliminary announcement on 2* *182 kHz. The class of emission
to be used for radiotelephony on the frequency 2* *182 kHz shall be J3E.
Distress traffic on 2* *182 kHz following the reception of a distress
call using digital selective calling should take into account that some
shipping in the vicinity may not be able to receive this traffic.

2\) If a distress message on the carrier frequency 2* *182 kHz has not
been acknowledged, the distress call and message may be transmitted
again on a carrier frequency of 4* *125 kHz or 6* *215 kHz, as
appropriate.

3\) However, ship stations and aircraft which can transmit neither on
the carrier frequency 2* *182 kHz nor on the carrier frequencies 4* *125
kHz or 6* *215 kHz, may use any other available frequency on which
attention might be attracted.

4\) Coast stations using the carrier frequency 2* *182* *kHz for
distress purposes and to send navigational warnings may transmit an
audible alarm signal[^5] of a short duration for the purpose of
attracting attention to the message which follows.

*B -- 4 125 kHz*

§ 2 1) The carrier frequency 4* *125 kHz is used to supplement the
carrier frequency 2 182 kHz for distress and safety purposes and for
call and reply. This frequency is also used for distress and safety
traffic by radiotelephony.

2\) The carrier frequency 4* *125 kHz may be used by aircraft to
communicate with stations of the maritime mobile service for distress
and safety purposes, including search and rescue.

C -- 6 215 kHz

§ 3 The carrier frequency 6* *215 kHz is used to supplement the carrier
frequency 2* *182 kHz for distress and safety purposes and for call and
reply. This frequency is also used for distress and safety traffic by
radiotelephony.

Section II -- Protection of distress and safety frequencies

A -- General

§ 4 1) Test transmissions on any of the distress and safety frequencies
described above shall be kept to a minimum and, wherever practicable, be
carried out on artificial antennas or with reduced power.

§ 5 Before transmitting on any of the frequencies identified for
distress and safety communications, a station shall listen on the
frequency concerned to make sure that no distress transmission is being
sent (see Recommendation ITU-R M.1171). This does not apply to stations
in distress.

B -- 2 182 kHz

§ 6 1) Except for transmissions authorized on the carrier frequency
2* *182 kHz and on the frequencies 2* *174.5 kHz, 2* *177 kHz, 2* *187.5
kHz and 2* *189.5 kHz, all transmissions on the frequencies between
2* *173.5 kHz and 2* *190.5 kHz are forbidden (see also
Appendix **15**).

2\) To facilitate the reception of distress calls, all transmissions on
2 182 kHz should be kept to a minimum.

Section III -- Watch on distress frequencies

A -- 2 182 kHz

§ 7 1) Coast stations may maintain a watch on the carrier frequency 2182
kHz if so directed by the Administration. Such watch should be indicated
in the list of coast stations.

2\) Ship stations not fitted with equipment compatible with the GMDSS
are encouraged to keep the maximum watch practicable on the carrier
frequency 2* *182 kHz.

B -- 4 125 kHz, 6 215 kHz

§ 8 1) Coast stations may maintain additional watch, as permitted, on
the carrier frequencies 4* *125 kHz and 6* *215 kHz. Such watch, if
maintained, should be indicated in the list of coast stations.

Part A3 -- Distress communications

**Section I -- General**

§ 1 The distress call shall have absolute priority over all other
transmissions. All stations which hear it shall immediately cease any
transmission capable of interfering with the distress traffic, and shall
continue to listen on the frequency used for the emission of the
distress call. This call shall not be addressed to a particular station
and acknowledgement of receipt shall not be given until the distress
message which follows is sent.

§ 2 The RT procedures for distress communications are found in Article
**32**.

Part A4 -- URGENCY and safety COMMUNICATIONS

**Section I -- Urgency signal and messages**

§ 1 The RT procedures for Urgency and safety communications are found in
Article **33**.

Section III -- Safety signal and messages

§ 7 In radiotelephony, the safety signal consists of the word SÉCURITÉ
pronounced clearly in French. The safety signal shall be repeated three
(3) times before the call.

§ 8 1) The safety signal indicates that the station is about to transmit
a message containing an important navigational or an important
meteorological warning.

2\) The safety signal and call shall be sent on one or more of the
international distress frequencies (2* *182 kHz) or on any other
frequency which may be used in case of distress (see also
No.** 33.32**).

3\) The safety message which follows the call should be sent on a
working frequency. A suitable announcement to this effect shall be made
at the end of the call.

4\) In the maritime mobile service, safety messages shall generally be
addressed to all stations. In some cases, they may be addressed to a
particular station.

§ 9 § 4 All stations hearing the safety signal shall listen to the
safety message until they are satisfied that the message is of no
concern to them. They shall not make any transmission likely to
interfere with the message.

Reasons: Consequential to GMDSS implementation.

######## Proposal for Issue B:

USA/ / 159 MOD

APPENDIX 18 (WRC-07)

Table of transmitting frequencies in the VHF\
maritime mobile band

(See Article **52**)

**Reasons**: Consequential date change.

**USA/ / 160** **MOD**

NOTE A -- For assistance in understanding the Table, see Notes a) to p)
below.     (WRC‑07)

NOTE B -- The Table below defines the channel numbering for conventional
maritime VHF based on 25 kHz channel spacing and use of several duplex
channels but allows also the use of 12.5 kHz channel spacing. The
channel numbering for 12.5 kHz channels and the conversion of
two-frequency channels for single-frequency operation shall be in
accordance with Recommendation ITU‑R M.1084-4 Annex 4, Tables 1 and 3.

**Reasons**: Clarification.

**USA/ / 161** **MOD**

**Reasons**: Clarification; consequential to note changes

**Notes referring to the Table**

*General notes*

USA/ / 162 MOD

*e)* Administrations may apply 12.5 kHz channel interleaving on a
non-interference basis to 25 kHz channels, in accordance with the most
recent version of Recommendation ITU-R M.1084, provided:

-- it shall not affect the 25 kHz channels of the present Appendix
maritime mobile distress and safety frequencies, especially the channels
06, 13, 15, 16, 17, and 70, nor the technical characteristics set forth
in Recommendation ITU‑R M.489-2 for those channels;

-- implementation of 12.5 kHz channel interleaving and consequential
national requirements shall be subject to prior agreement between the
implementing administrations and administrations whose ship stations or
services may be affected.

**Reasons**: Clarification and consequential updates.

USA/ / 163 MOD

*Specific notes*

*f)* The frequencies 156.300 MHz (channel 06), 156.525 MHz (channel 70),
156.800 MHz (channel 16), 161.975 MHz (AIS 1) and 162.025 MHz (AIS 2)
may also be used by aircraft for the purpose of search and rescue
operations and other safety related communication.

**Reasons**: Clarification and updates consequential to GMDSS and AIS.

USA/ / 164 MOD

*l)* These channels (AIS 1 and AIS 2) are used for an automatic
identification system capable of providing worldwide operation in
accordance with ITU-R Recommendations, unless other frequencies are
designated on a regional basis for this purpose.

**Reasons**: Clarification and consequential updates.

USA/ / 165 MOD

*m)* These channels may be operated as single frequency channels,
subject to prior agreement between interested and affected
administrations.     (WRC‑07)

*o)* These channels may be used to provide bands for new technologies,
subject to prior agreement between interested and affected
administrations. Stations using these channels or bands for new
technologies shall not cause harmful interference to, and shall not
claim protection from, other stations operating in accordance with this
appendix or Article **5**. The design of such systems shall be such as
to preclude the possibility of interference to the detection of AIS
signals on 161.975 or 162.025 MHz. (WRC‑07)

**Reasons**: To enable new wideband data systems in these bands, while
ensuring they do not interfere with the reception of AIS.

USA/ / 166 ADD

*p)* Additionally, AIS 1 and AIS 2 may be used by the maritime
mobile-satellite service (Earth-to-space) for the reception of AIS
transmissions from ships.

**Reasons**: to recognize long range detection of AIS for security
reasons.

USA/ / 167 ADD

*q)* When using these channels (10 and 11), all precautions should be
taken to avoid harmful interference to channel 70.

**Reasons**: Consequential to GMDSS implementation.

\_\_\_\_\_\_\_\_\_\_\_\_\_\_

[^1]: 32.13B.1   It should be noted that there is a higher probability
    of successful reception of a distress message if the distress
    message is preceded by a DSC alert.

[^2]: ^1^ The term "Rescue Coordination Centre" as defined in the
    International Convention on Maritime Search and Rescue (1979) refers
    to a unit responsible for promoting the efficient organization of
    search and rescue services and for coordinating the conduct of
    search and rescue operations within a search and rescue region.

[^3]: ^2^ The use of the Standard Marine Communication Phrases and,
    where language difficulties exist, the International Code of
    Signals, both published by the International Maritime Organization,
    is also recommended.

[^4]: ^3^ Mobile stations communicating with the stations of the
    aeronautical mobile (R) service in bands allocated to the
    aeronautical mobile (R) service shall conform to the provisions of
    the Regulations which relate to that service and, as appropriate,
    any special arrangements between the governments concerned by which
    the aeronautical mobile (R) service is regulated.

[^5]: Alarm signals may consist of transmissions of sinusoidal audio
    frequency tones 1 300 Hz, 2 200 Hz, or both. Different tone
    generation patterns may be used to signal the type of message which
    follows, and an alarm signal ending in a 10-second continuous tone
    could be used to identify a transmission by a coast station.