Thanks for all the information.
I kind of thought the sound contacts while surfaced was a "glitch" since I couldn't *order* any kind of hydrophone activity even though it was clearly happening on its own. It only seemed to happen in very rough weather, at which time I was also getting intermittent reports from the LI that the boat was at 10 m depth - which it was, intermittently, because we were getting knocked up and down so by the waves.
I'm guessing there are certain things that are set to happen in-game when triggered by the boat's depth, like the LI reporting it at 10 m intervals and the hydrophone guy going into action, even if the "depth" is temporary and due to surface weather beating the boat down.
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