One thing I can add to that fixed wire method description you have is if you stop your boat, or nearly stop your boat, you don't have to turn to put the target at 0 or 180 relitive bearing. That comes in handy if you have already got so close that closing on the target any further might spook them or put you too close to fire on them. Other than that you have a very firm grasp on the fixed wire method of obtaining target's speed.
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