i think thats correct, it is the range inside which you are more likely to be detected based on a number of factors. i have been WELL inside this circle in very close proximity to a destroyer... and i was surfaced. It was dark with rough seas and i was barely moving at 2 knots. he never saw me.
So i wouldnt give much merit to these dashed circles.
PS im using GWX so if your using another flavor of SH3 i cant make promises you will have the same experience.
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