# Presentation: 776671

## IMO Activities Relating to the Maritime Use of Global Navigation Satellite Systems

**LCDR William Burns**
**Office of Aids to Navigation**
**U.S. Coast Guard Headquarters**

## Evolution of Current Policy

- For maritime users, IMO is the international organization that will recognize a GNSS as a system which meets the carriage requirements for position-fixing equipment for a World-Wide Radionavigation System (WWRNS)

## Evolution of Current Policy

- IMO Resolution A.815(19)
**Recognition by IMO of a radionavigation system would mean that the Organization accepted that the system is capable of providing adequate position information within its coverage area and that the carriage of receiving equipment for use with the system would satisfy the relevant requirements of the 1974 SOLAS Convention.**
**The provision and operation of a radionavigation system is the responsibility of the Governments or organizations concerned.**

## Current Policy

**IMO Resolution A.815(19) **
**	****Established Operational Requirements**
**Accuracy**
**Signal Availability**
**Service Reliability (Continuity)**
**Coverage Area**
**Update Rate of Position Data**
**Warning of  System Malfunction**

**Notes:**
Continued Ops past the year 2000
1999 FRP: “While the Administration continues to evaluate the long-term need for continuation of the Loran-C radionavigation system, the Government will operate the Loran-C system in the short term. The U.S. Government will give users reasonable notice if it concludes that Loran-C is not needed or is not cost effective, so that users will have the opportunity to transition to alternative navigation aids.”

## IMO Resolution A.815(19)

**IMO recognized the GPS Standard Positioning Service as a component of the World-Wide Radionavigation System (WWRNS) for maritime interests in June 1996**
**IMO also recognized GLONASS as a component of the WWRNS in December 1996**

## Path for System Recognition

## Factors for System Recognition

**In deciding whether or not to recognize a radionavigation system, IMO considers:**
**The Government or organization providing and operating the system has stated formally that the system is operational and available for use**
**Its continued provision is assured**
**It meets the prescribed accuracy, availability, reliability (continuity), etc.**
**Adequate arrangements have been made for publication of the characteristics and parameters of the system and its status**
**Adequate arrangements have been made to protect the safety of navigation should changes be made in the system**

## Outlook

**The long period required to develop and implement a GNSS has led the Organization to formulate the maritime requirements for future GNSS(s) at an early stage**
**The Sub-committee on Safety of Navigation recently reviewed IMO Resolution A.860(20) on Maritime Policy for a Future GNSS and submitted the revision to the Maritime Safety Committee**

## IMO Resolution A.860(20)

_**Recognized 3 major needs for new policy**_
**Need for a future civil and internationally-****controlled GNSS **
**Needs for a future GNSS are not restricted to general navigation only**
**Need to identify early the maritime user requirements**
**	****for a future GNSS**

**Notes:**
Equipment to be replaced
TTX; Timing Equip; LSOS; Cesiums; RF Switches; SSX TOPCO’s
Reduce Recurring OE
Eventual automation of Lorsta’s
New equipment with warranties e.g. cesiums w/ 10 yr warranty pkg
SSX vs. old TTX’s (tubes)
Current OE ~$27M (note: rounding errors in the BAH report  make total $28M)
Ops Personnel 			$12M
Support Personnel		$6M
O&M (incl utilities)			$6M
Electronics Fac Support & Maint	$4M
Increase Equipment Reliability
Install Overall UPS units
New integrated technology = fewer boxes with fewer connections
Automate and Remove Loran Station Personnel
PALS @ Jupiter is first step
SSX and other new equip is key to this working

## Availability (% per 30 days) = 99.8% (for all phases of navigation)
Continuity (% over 3 hours) = 99.97% (for Port approach and restricted waters, Port, and Inland waterways)Continuity is not relevant to ocean and coastal navigation
Coverage = Global for Ocean and Coastal;Regional for Port approach and restricted waters, and Inland waterways;Local for Port
Fix interval (seconds) = One second for all phases of navigation

**Continuity (% over 3 hours) = 99.97% (for Port approach and restricted waters, Port, and Inland waterways)****Continuity is not relevant to ocean and coastal navigation**
**Coverage = Global for Ocean and Coastal;****Regional for Port approach and restricted waters, and Inland waterways;****Local for Port**
**Fix interval (seconds) = One second for all phases of navigation**

**A.860(20):  Service Level Parameters**

## Absolute Accuracy = 10 meters horizontally (for Ocean, Coastal,    Port approach and restricted waters, and Inland waterways)= 1 meter horizontally (for Port)
Integrity:Alert limit = 25 meters (for Ocean, Coastal, Port approach and restricted waters, and Inland waterways)= 2.5 meters (for Port)
Time to alarm = 10 seconds (for all phases of navigation)
Integrity risk (per 3 hours) = 10-5 (for all phases of navigation)

**Integrity:****Alert limit = 25 meters (for Ocean, Coastal, Port approach and restricted waters, and Inland waterways)****= 2.5 meters (for Port)**
**Time to alarm = 10 seconds (for all phases of navigation)**
**Integrity risk (per 3 hours) = 10****-5 ****(for all phases of navigation)**

**A.860(20):  System Level Parameters**