
Structure Upon receipt of a DSC Distress Alert acknowledgement the vessel in distress should commence the distress traffic on one of the international distress traffic frequencies for telephony (VHF Channel 16 or 2182 kHz) as follows:
MAYDAY THIS IS - the 9-digit Maritime Mobile Service Identity code (MMSI) plus name / call sign or other identification of the vessel calling
- the position of the vessel
- the nature of distress
- the assistance required
- any other information which might facilitate rescue
Example
MAYDAY
- THIS IS TWO-ONE-ONE-TWO-THREE-NINE-SIX-EIGHT-ZERO MOTOR VESSEL "BIRTE" CALL SIGN DELTA ALPHA MIKE KILO
- POSITION SIX TWO DEGREES ONE ONE DECIMAL EIGHT MINUTES NORTH
- ZERO ZERO SEVEN DEGREES FOUR FOUR MINUTES EAST
- I AM ON FIRE AFTER EXPLOSION
- I REQUIRE FIRE FIGHTING ASSISTANCE
- SMOKE NOT TOXIC OVER
Structure After the transmission of a DSC Urgency Call switch the transmitter to VHF Channel 16 or frequency 2182 kHz (if not automatically controlled) and commence the urgency traffic as follows:
PAN-PAN (repeated three times) ALL STATIONS (repeated three times)
THIS IS - the 9-digit MMSI of the vessel plus name / call sign or other identification
- the position of the vessel
- the text of the urgency message.
Example
PAN-PAN PAN-PAN PAN-PAN
ALL STATIONS ALL STATIONS ALL STATIONS
- THIS IS TWO-ONE-ONE-TWO-THREE-NINE-SIX-EIGHT-ZERO MOTOR VESSEL "BIRTE" CALL SIGN DELTA ALPHA MIKE KILO
- POSITION SIX TWO DEGREES ONE ONE DECIMAL EIGHT MINUTES NORTH ZERO ZERO SEVEN DEGREES FOUR FOUR MINUTES EAST
- I HAVE PROBLEMS WITH ENGINES
- I REQUIRE TUG ASSISTANCE OVER
Structure After the transmission of a DSC Safety Call switch the transmitter to VHF Channel 16 or frequency 2182 kHz (if not automatically controlled) and transmit the safety message as follows:
SECURITE (repeated three times)
ALL STATIONS (or all ships in a specific geographical area, or to a specific station) (repeated three times)
THIS IS - the 9-digit MMSI of the vessel plus name / call sign or other identification
- the text of the safety message.
Example
SECURITE SECURITE SECURITE
ALL SHIPS ALL SHIPS ALL SHIPS IN AREA PETER REEF
- THIS IS TWO-ONE-ONE-TWO-THREE-NINE-SIX-EIGHT-ZERO MOTOR VESSEL "BIRTE" CALL SIGN DELTA ALPHA MIKE KILO
- DANGEROUS WRECK LOCATED IN POSITION TWO NAUTICAL MILES SOUTH OF PETER REEF OVER
(i) INSTRUCTION
This indicates that the following message implies the intention of the sender to influence others by a Regulation.
Comment: This means that the sender, e.g. a VTS - Station or a naval vessel, must have the full authority to send such a message. The recipient has to follow this legally binding message unless s/he has contradictory safety reasons which then have to be reported to the sender.
Example: "INSTRUCTION. Do not cross the fairway.”
(ii) ADVICE
This indicates that the following message implies the intention of the sender to influence others by a Recommendation.
Comment: The decision whether to follow the ADVICE still stays with the recipient.
ADVICE does not necessarily have to be followed but should be considered very carefully.
Example: "ADVICE. (Advise you) stand by on VHF Channel six nine.
(iii) WARNING
This indicates that the following message implies the intention of the sender to inform others about danger.
Comment: This means that any recipient of a WARNING should pay immediate attention to the danger mentioned. Consequences of a WARNING will be up to the recipient.
Example: "WARNING. Obstruction in the fairway."
(iv) INFORMATION
This indicates that the following message is restricted to observed facts, situations, etc..
Comment: This marker is preferably used for navigational and traffic information, etc.. Consequences of INFORMATION will be up to the recipient.
Example: "INFORMATION. MV Noname will overtake to the West of you ."
(v) QUESTION
This indicates that the following message is of interrogative character.
Comment: The use of this marker removes any doubt on whether a question is being asked or statement being made, especially when interrogatives such as What, Where, Why, Who, How are additionally used at the beginning of the question. The recipient is expected to return an answer.
Example: "QUESTION.( What is ) your present maximum draft?"
(vi) ANSWER
This indicates that the following message is the reply to a previous question.
Comment: Note that an answer should not contain another question.
Example: "ANSWER. My present maximum draft is zero seven metres."
(vii) REQUEST
This indicates that the following message is asking for action from others with respect to the vessel.
Comment: The use of this marker is to signal: I want something to be arranged or provided, e.g. ship´s stores requirements, tugs, permission, etc.. Note:
REQUEST must not be used involving navigation, or to modify COLREGS.
Example: "REQUEST. I require two tugs."
(viii) INTENTION
This indicates that the following message informs others about immediate navigational action intended to be taken.
Comment: The use of this message marker is logically restricted to messages announcing navigational actions by the vessel sending this message.
Example: "INTENTION. I will reduce my speed."