Depending on weather, I approach a convoy at PD or slightly deeper. Speed, 1 tp 2 knots. Keep the scope down 'til ready to shoot. Also make sure you're on silent running mode.
This is not a sight seeing tour. Once your scope is up, it will soon be spotted and reported to escorts, who will converge on you like flies. So you only have a few seconds to fire your torpedoes and get the hell away from datum and go deep.
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