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Old 15th November 2008 | 17:30
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RansS9
 
Joined: Oct 2007
Posts: 107
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From: coventry
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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