These are a set of 39 flags, 26 letters, 10 numbers, 3 substitute flags and one answering pennant. They are used by ships at sea to indicate various conditions of the ship and the activities it is engaged in. Examples of this would be if a vessel had a diver down and was warning other nearby ships to stay clear.
| A | I have a diver down, keep well clear and at a slow speed. |
| B | I am taking on, carrying or discharging dangerous goods. |
| C | Yes, affirmative. |
| D | Keep clear of me, I am manoeuvring with difficulty. |
| E | I am directing my course to starboard. |
| F | I am disabled, communicate with me. |
| G | I require a pilot; I am hauling nets. |
| H | I have a pilot on board. |
| I | I am directing my course to port. |
| J | I am on fire and have dangerous cargo on board. Keep well clear. |
| K | I wish to communicate with you. |
| L | You should stop. I have something important to communicate. |
| M | My vessel is stopped and making no way through the water. |
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