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Old 12th Jan 2014, 22:05
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fireflybob
 
Join Date: Jun 2001
Location: UK
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Think of a fish in a goldfish bowl. It has a speed relative to the water as it swims along in it. (TAS) Now move the bowl (WIND) - the speed of the bowl relative to the earth is equivalent to GROUNDSPEED.

Hope this helps!
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