No no no gents, I'm not talking about radar contacts and radio reports received from B-Dienst, but HF/DF contacts (HF/DF = high frequency direction finder) just as described in the abovementioned u-boat.net article (thank you for the link).
But anyway, I was perhaps a bit hasty in my judgement of the poor guy and his allegedly supernatural capabilities in defining the target's speed, etc. based on a single contact, because what he obviously does is that he receives multiple contacts from the same source first and then of course uses them all in defining the target's status! It's just that the game doesn't indicate this in any way... D00H
That aside I _still_ think the guy's a bit über, because IRL using passive RF technology there'd be no way of defining the target's location without resorting to triangulation, i.e. using 2 receivers and their relative bearings-to-target to calculate a position. Thus I'm still inclined to think I've someone aboard here who needs to be treated with utmost courtesy, lest he gets pissed off and then curses us all