Call me Crazy but
On initial set up I run parallel to see what the bearing rate is and figure an estimate that way based on how much I am controling by my own speed - a simplier way that works 90 percent of the time.
Slow = 3-5Kts
Med = 10-12 kts
fast = 15+
These are good starting points - I have found that the bulk of the Merchies operate at about 5kts, Cruise ships at 15 and warships (TF) at 11.
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