David Read wrote: > Is this because I have a rubbish GPS receiver or could it be that the > buildings of Islington are causing sufficient reflection/disturbance to the > signal?
I get similar wandering paths by bicycle. It could be a matter of placement. From my experience, you can put your GPS on your handlebars, which puts the receiver in a spot where it can get the best signal, or you can live with it. Right now, I don't have a bicycle mount for my satnav yet, so I put it in the key pouch of my pannier (and leave my keys in my pocket). When I work on the GPX, I convert the track to OSM, split out and delete the clearly wayward segments based on aerial photography, and let the rest fly. This is a LOT easier to do if your GPS happens to record HDOP in data in the GPX (since you can then color-code the GPX by HDOP and discard anything that the GPS doesn't indicate is close to reality). The metal on the bicycle itself (given the pannier's low-slung position next to the rear wheel), trees overhead, and vehicles passing closely on the pannier (right) side of the bike tend to be the biggest factors in terms of reflectivity, and it does seem to be reflectivity causing the problem for me.
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