Subject: glhemaokpa margin of error
Date: Feb 05, 2001 @ 22:26
Author: Bill Hanrahan ("Bill Hanrahan" <hanrahan@...>)
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Recap from Mike's previous posting regarding glhemaokpa margin of error:
 
"our 2 gps receivers were not fully synchronized &
actually disagreed in the end by a couple hundred feet i believe
tho i was trusting & going with bills more than toms
since tom couldnt even say which nad he was using
& was probably using "
 
I believe that Cpt. Tom was using NAD27 as I was.  His older Magellan handheld GPS correlated within .02 nautical miles of my Garmin handheld unit.  Given that one nautical mile = 6,076 feet (about 1,852 meters), this would translate to 121.52 feet (assuming that the ".02" is a precise number, which it is not.)  Obviously, this also doesn't take into account the "standard" GPS margin of error (with Selective Availability turned off).  Anyway, we were close...and could indeed be at the exact spot.
 
Bill