Phonetic alphabet is more a radio convention than a navigational convention, and is also used by terrestrial radio users (ie military). Alfa/bravo/charlie was a

Phonetic alphabet is more a radio convention than a navigational convention, and is also used by terrestrial radio users (ie military). Alfa/bravo/charlie was adopted as a NATO standard in the 1950’s; during WWII the US and U.K. used the able/baker/charley phonetic alphabet. And I think aviation adopted the NATO standard before maritime radio.