I approach convoys at periscope depth, as the surface noise makes it harder to detect a U-boat. I try to avoid daylight approaches because even a quick look-see may get your scope detected.
If the escort is closer than 2,000 meters. I keep my scope down until ready to fire torpedoes. I keep ploting the escort's position by marking the spot and updating every minute.
I use GWX 1.03 (presently 1940) . On GWX 1.01 reached mid 1942. I play DID.
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