Thursday, May 12, 2011

Garmin 210 -- upload troubles but consistent inaccuracy

Today's run (street): 2.5 miles

Yesterday's run, as recorded by the Garmin 210, came up short when compared to route mapping on both Gmaps and Google Earth. The variance in distance was about -2.5%. That seems close when viewed reciprocally (being 97.5% accurate) but I commonly saw less than +/-1% variance with a calibrated foot pod. I tried to upload my run to Garmin Connect so I could view the GPX and KMZ files that would show the recorded vectors against a Google map and, perhaps, reveal where the GPS capture cut corners. Unfortunately that attempt didn't work within the time I had to try it so I'll fight that battle this weekend.

I went out today and followed the same route as Wednesday, using yesterday's distance as a benchmark. Both runs felt about the same but I ran about 39 seconds longer this morning. The Garmin recorded the route .01 miles less than yesterday's distance so at least the 210 is consistent in its inaccuracy. I'm disappointed with Garmin for having such poor documentation related to uploading runs and I'm also disappointed to discover that the GPS is under-recording my distance. But I do like the watch and I'm certain that I'll get it all figured out eventually.

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