These are signal code flags. In this system of flags each letter is represented by a flag that has a different design. In the International Code of Signals a complete set consists of 26 alphabet flags, 11 pennants and 3 substitute flags. The flags are done in limited colors that are contrasting. The colors are Old Glory Red, Old Glory blue, white, black and yellow. This allows for easy recognition. These nautical flags not only represent letters of the alphabet but also signal simple messages. They include distress, compass points and bearings, geographical positions, time and position, latitude and longitude and maneuvering. Flags at sea are used when there is danger or if a ship loses radio contact. The basic meaning for each flag is as follows:
| Flag: |
Meaning: |
| A Alpha |
diver down-keep clear |
| B Bravo |
carrying dangerous cargo |
| C Charlie |
yes |
| D Delta |
keep clear |
| E Echo |
altering course to starboard |
| F Foxtrot |
I am disabled |
| G Golf |
I want a pilot |
| H Hotel |
a pilot on board |
| I India |
I am altering course to port |
| J Juliet |
vessel instantly |
| K Kilo |
I want to communicate with you |
| L Lima |
stop your vessel instantly |
| M Mike |
my vessel is stopped |
| N November |
no/negative |
| P Papa |
vessel about to leave port/sail |
| Q Quebec |
I request free pratique |
| R Romeo |
reverse course |
| S Sierra |
engines are going astern |
| T Tango |
keep clear |
| U Uniform |
you are heading into danger |
| V Victor |
require assistance |
| W Whiskey |
require medical assistance |
| Y Yankee |
I am dragging anchor |
| Z Zulu |
I require a tug |