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Old 27th February 2006 | 20:34
  #33 (permalink)  
englishal

 
Joined: May 2001
Posts: 4,729
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From: 75N 16E
The constellation isn't geostationary; it moves about all the time. So there can't be location-consistent coverage gaps.
HDOP and PDOP spring to mind........

Which the GPS tells you
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