In the stormy north (!) North Atlantic especially, the hydrophones ALWAYS work better - and at longer range - than visual. From experience, set your submerged speed at Run 1 (Dead Slow) and go down to at LEAST 20m/60ft. Do this on a regular basis, alternating between surface observation - primarily to recharge the batteries - and dived. In any case, targets ARE hard to find! There's nothing YOU'RE doing wrong!
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