Well all the ships would have had lookouts
Especially the escorts
Your wake from periscope or the periscope itself can be spotted as could the steam torp
And ships do communicate with each other
The escorts in SH3 invariably go for your last known position
If you are close to a convoy shoot and dive with minimum use of scope and change position quickly
Especially in calm seas
Rough weather and the night are your allies early in the war
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