When you are on the right bearing, the sound disappears at exactly 5000m for each gain step. Gain 1: 5000m, Gain 2: 10000m and so on.
I use this to measure the distance. In most cases it works better than trying to use overdrive when ranging the closest ship.
From this gain setting, you can turn it up 1.5-1.7 gain steps before the sound starts clipping. This is more subjective so less accurate. Onset of clipping is different depending on the type of ship so you won't get the best result, but on the other hand, you can get an accurate bearing at the same time.
So a ship at 5000m distance:
- sound will disappear at 1 gain
- sound will go into overdrive at around 2.5 - 2.7 gain
You can turn it around:
- the sound disappeared at 0.4 gain
- distorts at 1.9 - 2.1
Distance is 2000m
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