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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
OQ OQ AIDS TO NAVIGATION-NAVIGATION ELECTRONIC NAVIGATION My position is ascertained by electronic position fixing syste
OR OR AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING I have struck a mine.
OR OR AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING I have a mine in my sweep (or net)
OS OS AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING There is danger from mines in this area (or area indicated).
BT BT 4 DISTRESS-EMERGENCY AIRCRAFT-HELICOPTER Helicopter is coming to you now (or at time indicated) with inflatable raft.
OS OS 1 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING You should keep a lookout for mines.
OS OS 2 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING You are out of the dangerous zone.
OS OS 3 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Am I out of the dangerous zone?
OS OS 4 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Are you out of the dangerous zone?
OS OS 5 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Is there any danger from mines in this area (or area indicated)?
OT OT AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Mine has been sighted in lat... long... (or in direction indicated-Complements Table 3, Chapter 2, Section 10, Page 104).
OU OU AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Mine(s) has (have) been reported in the vicinity (or in approximate position lat... , long...).
OV OV AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Mine(s) is (are) believed to be bearing... from me, distance... miles.
OW OW AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING There is a minefield ahead of you. You should stop your vessel and wait for instructions.
OW OW 1 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING There is a minefield along the coast. You should not approach too close.
BU BU DISTRESS-EMERGENCY AIRCRAFT-HELICOPTER A helicopter/boat is coming to take injured/sick.
OX OX AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING The approximate direction of the minefield is bearing... from me.
OY OY AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Port is mined.
OY OY 1 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Entrance is mined.
OY OY 2 AIDS TO NAVIGATION-NAVIGATION MINES-MINESWEEPING Fairway is mined.

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