Thx Threadfin but I know how to use map, contacts on, and I use 3 min
15 sec for interval to get Kms. The difficulty is with determining
speed in the midst of attacking a convoy. No time
to plot! With PK on US subs you could guess and check
on the attack map. Can't do that on U boats! But, does make
it more challenging to attack and evade!
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