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static port location on Series 6

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MichaelGibbs(at)cox.net
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Posted: Wed Mar 15, 2006 9:28 am Post subject: static port location on Series 6

Bradley sez:



 	  Quote: 	
		  ...our GPS reading is significantly off from indicated (by a couple 

thousand feet). Now that you mention it, I think it is due to 

setting 29.92 at 18K'. Hence the GPS would be actual, and the 

altimeter would be relative.


	


Michel is right about GPS altitude errors, even with selective 

availability turned off.  GPS altitude is based on a computer model 

of the earth's shape, not your actual distance from the dirt, and can 

be off considerably. Long-term testing of a GPS unit at a particular 

location will not reveal errors in the earth-model.



Although GPS is a 3-dimensional positioning system, the altitude 

component does not have the same accuracy that lateral position has.



Mike G.

N728KF

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