[time-nuts] GPS altitude somewhat wrong?

Van Horn, David david.vanhorn at backcountryaccess.com
Thu Jun 9 13:05:18 EDT 2016

Using the thunderbolt here.

I only asked because a co-worker spotted the altitude and thought it was "wrong" for boulder.

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Mark Sims
Sent: Thursday, June 9, 2016 10:56 AM
To: time-nuts at febo.com
Subject: [time-nuts] GPS altitude somewhat wrong?

You have to be careful with a lot of modern GPS receivers.   Many implement some sort of "position pinning".   If they do not detect significant movement,  they either stop updating the coordinates  or heavily filter it...  you do not see the actual computed location.  On some receivers you have to move well over 10 meters before the position un-pins.
> CEP(95) of 1.5 meters over 1,000 seconds. 		 	   		  
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