Today's flag is: Golf
As a letter, that is the letter G. As a message, it means:
I require a pilot.
When made by fishing vessels operating in close proximity on the fishing grounds it means: “I am hauling nets”.
boof (OP) double-posted this 1 year ago, 1 day later, 1 day after the original post[^][v]#1,331,032
When the flag is presented flags that represent four or five numerals, the meaning is:
LONGITUDE (the last two numerals denote minutes and the rest degrees).
boof (OP) double-posted this 1 year ago, 1 day later, 5 days after the original post[^][v]#1,331,465
The declassified NATO information for flag Golf:
indication: GUIDE FLAG (See Article 2604 for optical guidance).
normally displayed: Where best seen.
a. WHILE FLYING: meaning: This ship is GUIDE.
b. G TACK Call Sign: meaning: Ship indicated is to be Guide (REPEATED BY ADDRESSEES).
c. Call sign G TACK Call Sign: meaning: Guide of unit addressed is to be ship indicated (REPEATED BY ADDRESSEES).
note TACK means tackline, a short piece of line used to separate flags in a signal hoist.