[Pisces]

There will be changes how the hydrophone station and it's gain works in the newer versions (not yet released) So I would not count too much on learning that rule of thumb.

Besides, that range doesn't tell you much. You know where it is, so just head there until you see something of it. The convoy is large enough so you won't miss it. Then consider how best to maneuvre to get visual data. Turn away to not get closer initially 'as you get your bearings' on what to do. You want to focus on speed and angle on bow (or something giving their course away). Range doesn't help you much when the torpedoes will leave your tubes and head straight away. It only helps in telling you when the impact is likely to occur. That is, if speed and AOB was correct to begin with. Otherwise it is a likely miss. Range is just a minor input to a correction for when the torpedo makes a turn towards the target.It is also a value for the torpedo salvo spread calculation if you decide to use that.