deerhunter is right, it will drift with the current and move very slowly, but what your sonarman hears more than anything with
a stationary target is the water slapping against the hull, the waves.
also auxcillary motor equipment like pumps and draining, maybe toilets flushing too,
all i know is that we cant hear it. thats what writes the name of the target in the sonar notepad as unknown,merchant, or warship.
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