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Not necessarily. Slow convoys would loose too much speed and were then easy pickings. My believe is that convoys would commence zigzagging when instructed by the Lead merchant ship or by an Escort. In general they would sail straight in some kind of formation to keep maximum speed.
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That's just not so. If you read the memoirs of the sub captains, every contact they made used a zig pattern, and analysing and timing that pattern was part of every approach and torpedo attack. There was no 50/50 about it.
The lack of zig plans greatly increases the ease of sinking large tonnage in game.
The only target I have read about so far that was not zigging was a Japanese sub on it's way into Rabaul harbor, with men in whites shining their shoes on the deck.