Yeah, I just plot their course and head for the 90 degree approach of that course line. Range is not relevant then.
Speed estimate mostly by shadowing at same speed, but after awhile one gets good enough at eyeballing it too.
Big believer in the KISS principle <g>, especially once airpower, radar, etc. come into play.
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"Realistic" is not always GAME-GOOD." - Wave Skipper 
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