I have found, when submerged, if I rotate the sonar sometimes I get a "hit".
The green light goes on, no sounds.
I surface and head off in that direction, submerge and recheck now and then.
And, sometimes I end up with a target.
If I ping that distant blurb, at times, I get a range of over 8 or 9 miles away.
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I spent the cold war under water.
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