sg

Çarşamba, Aralık 14, 2005

Slightly off target?


Hi, I am overlaying gpx data from my GPS onto Google Maps, but am finding that quite regularly the line goes off by an amount. Just slightly off the actual path. My GPS has WAAS switched on, although I don't check regularly that I have a 3D reception as I'm cycling along.

For example, the other day I was cycling along the Regents Canal path in London. Quite a lot of the maps is okay, but you can see from the following picture the path is too far to the left.

http://static.flickr.com/20/73335205_ac32dabb8c_o.jpg

Obviously I cannot be absolutely sure the GPS data is itself off the mark, or my code, but quite a lot of it is not correct. In fact, I must have swum across the canal a few times to get to the other side!

Anyone else noticed this, or is this something to expect?

Thanks

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