TGA or DDS, most of the main texture files use the DDS format. No idea where the texture is for the actual in-game map.
For trying to navigate using 200 year old Dutch charts based on some weird 14 1/2 inches to the foot unit, I read a hilarious description by an S-boat captain - Pigboat 39? Can't remember, anyway they ran aground in poorly charted waters at high tide, worked their butts off trying various things to lighten ship, eventually had to burn her where she was.
I read some descriptions of navigating shoal waters in a couple of books about detecting mines with the new FM sonar (late war), common precaution was flooding down a few feet so if you did run aground all you had to do was blow ballast and back away.
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