A ship might disappear from hydrophones if it enters an area where your hydrophones don't cover. The early model couldn't see directly in front. None can see directly behind when your motors are running.
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100% realism, DiD
Harbor Traffic 1.47(incl. RUB)
Using SH3 Commander to implement many custom realism tweaks
Covered 1939-1945; now restarting in 1939 again.
Completed 39 careers, 210 war patrols, 4.7Mt sunk, 19 subs lost
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