The Navy uses hydrophones to detect cavitation. I didn't have much interest in going that way but it would be fun just to see what you could hear at an anchorage in the evening. Another fun thing I've gone with the younger folk is to put a spotlight shining into the water and let them see what the light attracts. Better than video games!
I'd just tighten one notch and see the affect. And no, such an adjustment won't affect reverse.
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