Quote:
Originally Posted by robbythesub
Hello again
One further question if I may- one receives messages from other boats referring to activity in a square such as AM 4577.
I can see squares such as AM 97 etc, so what does the 4577 mean please?
Thanks 
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The kriegsmarine grids are sliced into smaller parts, like your telephone keys. So AM4577 would be first of all the big grid AM45, then imagine where 7 is in your telephone on that grid and then finally the last digit, 7, where that would be on that grid.
Here's a pic of AM4577 to show how it would be "sliced":
Lol, and here's finally the Uboat.net's article explaining it:
http://www.uboat.net/maps/grid.html