Yeah, I'd say the key tricks are silent running, approach from depth (below thermocline), and exercise strict periscope control when you do come up (pop the 'scope up for quick looks/short periods, then get it back down pronto).
I always try to move in from the flanks too - that is ahead of the convoy, but well displaced from their base course projection line.
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My Father's ship, HMCS Waskesiu (K330),
sank U257 on 02/24/1944
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