Regarding steaming towards the convoy and finally they appear. Doesn’t that only work in clear weather or slightly cloudy (I don’t remember the terms)? If it’s foggy you cannot do that, right? Because you won’t see the convoy until you’re dangerously close? I’ve never tried fog yet, so it’s just a guess.
About distance checking. I am poor at it myself. But I think you need to be close enough to distinguish a single ship, then count the propeller rotational speed (because I assume that affects sound level?) and then based on the combination of gain and propeller speed calculate the distance (I don’t know how). This is only my guess.
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