I made a four passes under the Cedar Key fishing pier using a Humminbird 997c SI and a towfish. Looks like there are plenty of things under there to snag a hook on or a fish from. Here are screen shots (using the Yellowfin viewer) of the recordings from the runs. Shallow saltwater, speed 3mph, chart speed 4 and default settings for everything else ...
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There are a few details here =>
Tight lines,
Darrell