IMO signal flags
Alphabet flags from the International Code of Signals. Flown singly, each flag has a defined meaning. In combination the meanings change — consult the Code.
| Letter | Name | Single-flag meaning |
|---|---|---|
| A | Alpha | I have a diver down; keep well clear at slow speed. |
| B | Bravo | I am taking in, discharging, or carrying dangerous goods. |
| C | Charlie | Affirmative — yes. |
| D | Delta | Keep clear — I am manoeuvring with difficulty. |
| E | Echo | I am altering my course to starboard. |
| F | Foxtrot | I am disabled; communicate with me. |
| G | Golf | I require a pilot. By fishing vessel: I am hauling nets. |
| H | Hotel | I have a pilot on board. |
| I | India | I am altering my course to port. |
| J | Juliet | I am on fire and have dangerous cargo — keep well clear. |
| K | Kilo | I wish to communicate with you. |
| L | Lima | You should stop your vessel instantly. |
| M | Mike | My vessel is stopped and making no way through the water. |
| N | November | Negative — no. |
| O | Oscar | Man overboard. |
| P | Papa | In harbour: vessel is about to proceed to sea. At sea: your lights are out or burning badly. |
| Q | Quebec | My vessel is healthy and I request free pratique. |
| R | Romeo | (No standalone meaning in the 1969 Code revision.) |
| S | Sierra | My engines are going astern. |
| T | Tango | Keep clear of me — I am engaged in pair trawling. |
| U | Uniform | You are running into danger. |
| V | Victor | I require assistance. |
| W | Whiskey | I require medical assistance. |
| X | X-ray | Stop carrying out your intentions and watch for my signals. |
| Y | Yankee | I am dragging my anchor. |
| Z | Zulu | I require a tug. By fishing vessel: I am shooting nets. |