A Warm Welcome To The Subsim Community > danny_M 
You Will Always Find Someone Here To Help You 
New To Silent Hunter <> Need Help <> Click On My Thread Link. 
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Post #24 Shaefer’s Season 2 Let's Play Silent Hunter 5 YouTube Videos 
You do not need to use the 3 circles.
Check out my tutorial post #146
All settings can be changed in TDW's Options File Editor Viewer in the TAI and Nav Map tabs.
Peter