Re: flare/mapblast/gps

From: Edward S Light (
Date: Sat Sep 01 2001 - 14:13:25 EDT

On Sat, 01 Sep 2001 11:44:41 -0600 Ron Lee <> writes:

>  The altitude readout from the GPS was within a foot of the value
> >on the marker. Nice!  
> Do not assume that your accuracy is typically this close.  A single
> channel GPS receiver has about 10 meter horizontal accuracy and
> 15 meters vertically.
> Ron Lee

Last year I got a simple GPS unit (the basic Garmin etrex) and since then
have taken about 100 measurements at my standard observing location. The
results:  in latitude, the measurements spanned a range of about 17
in longitude 14 meters and in elevation 31 meters.  The standard
(about the arithmetic means) were +/- 3.2 meters in latitude, 2.7 meters
in longitude, and 7.1 meters in elevation.  (Perhaps coincidentally, the
mean GPS elevation was within a foot of the value deduced from a

Clear and dark skies!
   Ed Light

Lakewood, NJ, USA
N 40.1075, W 074.2312 Hgt +24 m (80 ft)

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This archive was generated by hypermail 2b29 : Thu Sep 20 2001 - 17:55:52 EDT