<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt">Tom<br><br>You can try to repeat the experience with this same GPS and compare your results.<br><br>I dont know if this is the case for your. In urban areas, the tall buildings are obstacles to Satellilte signal. This increases the inaccuracy of GPS measurement. If you are close to a tall building, you wont receive a good signal from that direction. Your position is calculated with a principle of triangulation. You
need to receive the signal fo at least three satellites. And results are
far better with four.<br><br><div> </div><div><span style="font-style:italic;color:rgb(0, 0, 191);font-weight:bold;">Pierre <br></span><br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"> <div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">De :</span></b> Tom Taylor <tom.taylor.stds@gmail.com><br> <b><span style="font-weight: bold;">À :</span></b> 'Talk-CA OpenStreetMap' <talk-ca@openstreetmap.org> <br> <b><span style="font-weight: bold;">Envoyé le :</span></b> Dimanche 18 novembre 2012 10h43<br> <b><span style="font-weight: bold;">Objet :</span></b> [Talk-ca] GPS inaccuracy<br> </font> </div> <br>I had a frustrating experience last night, sorting out an
area in my neighbourhood. I laid down a GPS track totalling some 4 km. The whole track was about 10 meters to the west of the Bing and Canvec data already in place. North-south accuracy varied, but wasn't anywhere near so bad.<br><br>It doesn't seem worth uploading my track, though maybe I should investigate some more.<br><br>Tom Taylor<br><br>_______________________________________________<br>Talk-ca mailing list<br><a ymailto="mailto:Talk-ca@openstreetmap.org" href="mailto:Talk-ca@openstreetmap.org">Talk-ca@openstreetmap.org</a><br><a href="http://lists.openstreetmap.org/listinfo/talk-ca" target="_blank">http://lists.openstreetmap.org/listinfo/talk-ca</a><br><br><br> </div> </div> </blockquote></div> </div></body></html>