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Old 15th Nov 2008, 17:30
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RansS9
 
Join Date: Oct 2007
Location: coventry
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How does a GPS know your heading?
When I fly with a portable GPS how does it know my heading when it's not slaved to the compass/di and I haven't input information on the winds aloft?

Apologises in advance if there's a blindingly obvious answer.
TIM
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