You've actually got an escort in and out of port in Grey Wolves, realize it or not.
Upon starting your patrol, you should see a Destroyer Escort ahead of you. That's your escort ship. Follow it until it turns back to port. When returning from a patrol, just wait for it to arrive and guide you in.
Or, as a rule of thumb (which applies to all friendly ports and most enemy ones), stay in the middle of the strait/channel/river/sea. Mine-fields and sub nets are close to shore.
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