I use my fathometer all the time and tonight it saved me in shallow water where I was able to stay 10 meters off the harbor sediment and next to a disabled British warship I hit with an eel ... the 4 others that hunted me would not drop charges close to their stricken vessel .. so in time (6hrs) they gave up. I had conning tower damage so I navigated her by chart map and using my fathometer readings I manuevered closer deep into the cove and shallower where I knew they could not come after me. I stayed submerged until nightfall. Assured the British vessels were gone, I surfaced, repaired all damage and took off for base on the surface full ahead and pass the coffee.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html