The Asdic system in use in 1939 was unable to determine depth of a Sub. When the Sonar system came out in late '42 or '43 it could determine the depth of the Sub.I read this somewhere.I have gotten away from the escorts by going to 180 meters and shuting the motors off.(This works sometimes.) GWX is like a new game and a real challenge. Gotta luv it.
