I've found that the Hydrophone Operator will find contacts at 180° when the engines are off. The animation of him searching, though, still shows him skipping past the aft section of the boat.
On occasion, though, he seems to miss a boat that I know is there (from previous sighting). When I check the hydrophone myself, the sound is clearly audible, but the vessel type is "Unknown". It seems the Operator won't mention contacts that he hasn't figured out are either Merchant or Warship.
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