the line should actually "touch" the time between mesurements (in this case... 3 minutes?) and the distance traveled (400metres, right? [0.4 km] ) and then, extend it towards the knots...
I took a traight sheet of paper and used the nomograph on your screen, the target seems to have been moveing at around 5 knots.
is it clear enough? :hmm:
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Originally Posted by Thomen
They 'guesstimated' more often than not..
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