????
Either turn the boat to face him directly (0 degrees relative bearing), or turn completely away from him, so that you present your backside to him (180 degrees relative bearing).
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There was a post about an aparent suicidal but very efective technique, wich was to head directly for the enemy ship (thus presenting a very small profile to him) and when you got under his ASDIC you would make a 90 degree turn to side step him. I don't remember where I read that... I'll see if I can fish up the link later.
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