In 1940 you should be trying to make surface attacks at night against convoys. The UZO is so much better than the parascope you'll like it a lot! Plus you get a great overall view of the ships so you can pick out the best ones to destroy.
Like the others said get ahead of the convoy but then try to slip into it not by sitting still at 80m depth but by going ahead 1/3 on the surface so your waves are not quite as big and by running towards the ships that are heading towards you your closure rate will be around 13 + knots anyway so you should be inside the escorts quickly. Just dont park yourself right next to an enemy ship and they wont see you. Finding the speed and heading can be done while overhauling the convoy to get ahead of it or just guessing once your in it as a close shot from 800 or less meters is very unlikely to miss unless you enter some really wild numbers into your TDC.
Once the fireworks start the destroyers will turn to come towards you but you still have time to try and escape on the surface or you can choose to dive. I prefer staying up as long as I can. I've had patrols where I've penetrated the same convoy two or three times in the same night on the surface in GWX in 1940. The escorts are few and widely seperated, the real challenge is after the first attack making successful follow ups! With GWX the convoys will begin swerving and really screw with ya once you start sinking ships!
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