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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
QC QC 1 AIDS TO NAVIGATION-NAVIGATION TIDE You should wait until low water.
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.
CB CB 2 DISTRESS-EMERGENCY ASSISTANCE I require immediate assistance; I have damaged steering gear.
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.
QG QG 1 MANEUVERS AHEAD-ASTERN You should go slow ahead.
QG QG 2 MANEUVERS AHEAD-ASTERN You should go full speed ahead.
QG QG 3 MANEUVERS AHEAD-ASTERN You should keep going ahead.
QG QG 4 MANEUVERS AHEAD-ASTERN You should keep your engines going ahead.
QH QH MANEUVERS AHEAD-ASTERN You should not go ahead any more.
QI QI MANEUVERS AHEAD-ASTERN I am going astern.
QI QI 1 MANEUVERS AHEAD-ASTERN My engines are going astern
CB CB 3 DISTRESS-EMERGENCY ASSISTANCE I require immediate assistance; I have a serious disturbance on board.
QI QI 2 MANEUVERS AHEAD-ASTERN I will keep going astern.
QI QI 3 MANEUVERS AHEAD-ASTERN I will go astern.

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