APPENDIX

US/RUSSIA SUPPLEMENTARY SIGNALS FOR NAVAL VESSELS

IR 1 I am engaged in oceanographic operations.

IR 2 I am streaming/towing hydrographic survey equipment . . . . meters astern.

IR 3 I am recovering hydrographic survey equipment.

IR 4 I am conducting salvage operations.

JH 1 I am attempting to retract a grounded vessel.

MH 1 Request you not to cross my course ahead of me.

NB 1 I have my unattached hydrographic survey equipment bearing in a direction from me as indicated. . . . (Table 3 of IC

PJ 1 I am unable to alter course to my starboard.

PJ 2 I am unable to alter course to my port.

PJ 3 Caution, I have a steering casualty.

PP 8 Dangerous operations in progress. Request you remain clear of the hazard which is in the direction from me as indicat

. . . (Table 3 of ICS).

QF 1 Caution, I have stopped engines.

QS 6 I am proceeding to anchorage on course. . . .

QV 2 I am in a fixed multiple leg moor using two or more anchors or buoys fore and aft. Request you remain clear.

QV 3 I am anchored in deep water with hydrographic survey equipment streamed.

RT 2 I intend to pass you on your port side.

RT 3 I intend to pass you on your starboard side.

RT 4 I will overtake you on your port side.

RT 5 I will overtake you on your starboard side.

RT 6 I am/Formation is maneuvering. Request you remain clear of the hazard which is in the direction from me as indicate

. . (Table 3 of ICS).

RT 7 I shall approach your ship on starboard side to a distance of. . . . 100’s of meters (yards).

RT 8 I shall approach your ship on port side to a distance of. . . . 100’s of meters (yards).

RT 9 I shall cross astern at a distance of. . . . 100’s of meters (yards).

RU 2 I am beginning a port turn in approximately. . . . minutes.

RU 3 I am beginning a starboard turn in approximately. . . . minutes.

RU 4 The formation is preparing to alter course to port.

RU 5 The formation is preparing to alter course to starboard.

RU 6 I am engaged in maneuvering exercises. It is dangerous to be inside the formation.

RU 7 I am preparing to submerge.

RU 8 A submarine will surface within two miles of me within 30 minutes. Request you remain clear.

TX 1 I am engaged in fisheries patrol.

SL 2 Request your course, speed, and passing intention.

UY 1 I am preparing to launch/recover aircraft on course. . . .

UY 2 I am preparing to conduct missile exercises. Request you remain clear of the hazard which is in the direction from me 

indicated. . . . (Table 3 of ICS).

UY 3 I am preparing to conduct gunnery exercises. Request you remain clear of the hazard which is in the direction from m

as indicated. . . . (Table 3 of ICS).

UY 4 I am preparing to conduct/am conducting operations employing explosive charges.

UY 5 I am maneuvering in preparation for torpedo launching exercises. Request you remain clear of the hazard which is in 

direction from me as indicated . . . . (Table 3 of ICS).

UY 6 I am preparing to conduct/am conducting underway replenishment on course. . . . Request you remain clear.

UY 7 I am preparing to conduct extensive small boat and ship to shore amphibious training operations.

UY 8 I am maneuvering to launch/recover landing craft/boats.

UY 9 I am preparing to conduct/am conducting helicopter operations over my stern.

UY 10 I am testing my gun systems.

UY 11 I am testing my missile systems.

UY 12 I am preparing to conduct/am conducting gunnery/bombing exercises from aircraft on a towed target. Request you

remain clear of the hazard which is in the direction from me as indicated . . . (Table 3 of ICS).

ZL 1 I have received and understood you message.

ZL 2 Do you understand? Request acknowledgment.
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Special Warning Signals.—The following signals are used by Russian naval vessels to warn foreign vessels that they h

violated Regulations for entry, navigating and stopping in Russian Territorial Waters (Territorial Sea) or Russian 

land Waters:

By day these signals will be made by flags of the International Code of Signals. By night they will be in Morse Code by si

lamp. In addition, the signals may be transmitted by RT in plain language on 500 kHz, 2182 kHz and 156.8 MHz, as well a

voice using megaphone or any other amplifying device.

Warning signals to foreign submarines which are submerged:

The signal of two series of explosions with three explosions in each series (where the interval between the explosions 

series is one minute and the interval between the series is three minutes), means: You are in Russian waters. I demand that 

surface immediately. Unless you comply with this order within 10 minutes, a force of arms will be used against you.

An acoustic signal by sonar may be given simultaneously, with the same meaning as described above. The signal will con

of five dashes, each dash three seconds long, interval between dashes, three seconds.

SNG You have violated the Russian borders. I demand that you

leave Russian waters immediately.

SNO I demand that you leave Russian waters immediately.

Unless you do so, a force of arms will be used against you.

SNP You are violating the regulations for navigating and remaining in Russian waters. I demand that you cease violations.

SNR Despite warnings, you continue to violate the regulations

for navigating and remaining in Russian waters. You are to

leave them immediately.