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Flag Combinations

The purpose of the International Code of Signals is to provide ways and means of communication in situations related essen- tially to safety of navigation and persons, especially when language difficulties arise. In the preparation of the Code, account was taken of the fact that wide application of radiotelephony and radiotelegraphy can provide simple and effective means of communication in plain language whenever language difficulties do not exist.

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Flag Code Code Section Sub-Section Meaning
AP AP DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK I have... (number) casualties.
AQ AQ DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK I have injured/sick person (or number of persons indicated) to be taken off urgently. I cannot alight but I can lift injured/sick perso
AQ AQ DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK You cannot alight on the deck; can you lift injured/sick person
AQ AQ DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK I require a helicopter urgently to pick up injured/sick person
AQ AQ DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK You should send a helicopter/boat with a stretcher
AQ AQ DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK A helicopter/boat is coming to take injured/sick
AT AT DISTRESS-EMERGENCY ACCIDENT-DOCTOR-INJURED/SICK You should send injured/sick persons to me.
YH YH COMMUNICATIONS ACKNOWLEDGE-ANSWER I have received the following from... (name or identity signal of vessel or station).
YI YI COMMUNICATIONS ACKNOWLEDGE-ANSWER I have received the safety signal sent by... (name or identity signal).
YJ YJ COMMUNICATIONS ACKNOWLEDGE-ANSWER Have you received the safety signal sent by... (name or identity signal)?
YK YK COMMUNICATIONS ACKNOWLEDGE-ANSWER I am unable to answer your question.
YK YK COMMUNICATIONS ACKNOWLEDGE-ANSWER Received, or I have received your last signal ....
QD QD MANEUVERS AHEAD-ASTERN I am going ahead.
QD QD 1 MANEUVERS AHEAD-ASTERN My engines are going ahead.
QD QD 2 MANEUVERS AHEAD-ASTERN I will keep going ahead.
QD QD 3 MANEUVERS AHEAD-ASTERN I will go ahead.
QD QD 4 MANEUVERS AHEAD-ASTERN I will go ahead dead slow.
QE QE MANEUVERS AHEAD-ASTERN I have headway.
QF QF MANEUVERS AHEAD-ASTERN I cannot go ahead.
QG QG MANEUVERS AHEAD-ASTERN You should go ahead.

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