hmm, thx to both of you for the detailed anwers.
as sharkbit mentioned having so much to estimate by eye's estimation only was a bit intimidating to me.
I mostly (and successfully) use the "fast 90AOB"-method.
so range is not that important, but when attacking convoys you sooner or later have to aim at 70-80AOB too. and there's where exact range-data comes into play.
and I don't like the nav-map to use for that calculations .....
and yes, you're right.
Manos nav-map tools are really highly adequate.
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