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{{DISPLAYTITLE:GPS Accuracy of Garmin, Polar, and other Running Watches}}<div style="float:right;">__TOC__</div>
I evaluated the real world accuracy of GPS watches while running over 3,500 miles/5,600Km and recording over 14,000 data points as part of my evaluation of the [[Best Running Watch]]es. Under good conditions most of the watches are remarkably good, but when things get a little tough the differences become more apparent. [[File:Accuracy.jpg|none|thumb|600px|A graph of the accuracy of the GPS running watches.]]The table below is a vastly simplified summary of the results, rating the best device as a 10 then comparing the others. (Note that '10' does not indicate perfect, just the best I've measured so far.)
{{:GPS Accuracy-summary}}
=Methodology=
|- valign="top"
|[[File:Garmin620 Offset1.jpg|none|thumb|x500px|Here you can see the last repeat is offset. Starting at lap marker 49, the track follows the same outline as the more accurate tracks, but is offset. So marker 50 should be near 4, 51 near 37, 52 near 2, 53 near 1, and the finish near the start.]]
|[[File:Garmin620 Offset2.jpg|none|thumb|x500px|This is a simple out and back run of ~3 miles/5 Km, but you can see after the turn around the Garmin 620 records a gradulally gradually widening gap, even though it follows the right overall shape. (The outbound track is fairly accurate, the return is messed up.)]]
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=Device Specific Notes=
