On Sat, 01 Sep 2001 11:44:41 -0600 Ron Lee <ronlee@pcisys.net> 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 meters, in longitude 14 meters and in elevation 31 meters. The standard deviations (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 topographic map.) Clear and dark skies! Ed Light Lakewood, NJ, USA N 40.1075, W 074.2312 Hgt +24 m (80 ft) ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/sat/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Thu Sep 20 2001 - 17:55:52 EDT