What does it stand for?

[GoldenRivet]

Originally Posted by Checkmate King 2

Thanks

SSS means attacked by submarine

as the allies didnt use grid squares the location of the attack is given in Lat Long format.

this particular distress message comes from a ship called the S.S. Rio Claro, given the lat long coordinates she is likley to be sinking at a location about 400 miles west of Brest, France just outside the waters of the Bay of Biscay