Have to second pretty much everything Catfish has said. Generally, doctrine was to always be moving toward the target vs lying in wait, so often times they would approach even at five or six knots when running in from the front submerged, slowing down to take periscope peeks, then slowing to approach speed within 4-5000 m. The commander’s handbook stressed the shot needs to fall at the earliest possible moment.
I would show a U-boat on a parallel but opposite course, at periscope depth, perhaps 1500 m off the target track.
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