IMHO, the traffic should be scripted to have 50/50 zig-zag and straight running course, and that without your sub/uboat being discovered.
A straight run makes the ship/convoy arrive faster at destination, but is at higher risk. Zig-zag reduces the risk, but makes the voyage longer/slower. Hence a 50/50 part of each type.
That naturally forces more precise campaign scripting, but would make it worth while I guess.
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