OpenStreetMap
I made a trace in a park called 'Schaep en Burgh'. Well, that was not really a success! 10% accurate, 70% a total mess, and 20% somewhere in between...
Of course I'm walking under the trees and it was a total overcast during the trip. What made it slightly better was setting the option: "record only when accuracy is" from 10 meters to 4 meters. More tests with some better weather will follow. Maybe in the winter without the leaves, I will get a better reception and perhaps also another device would perform better. I'm planning on buying the HTC Touch Pro. It'll come bundled with the latest TomTom version somewhere in october.
Nevertheless, I did some road laying and more, because I know that place very well.
Discussion
Comment from chillly on 28 August 2008 at 18:42
I don't think the weather affects accuracy much. Tree cover certainly does. Satellite positions vary all the time so good reception varies with time. Some places need many traces to get an average track.
Comment from Hans van Wijk on 31 August 2008 at 10:48
I made trace #2 in Schaep en Burgh, but the result was really awfull! I walked i.e. a strait line for almost a km, but the trace was viering way off course. I also walked a few segments three times and every time the trace was something completely different. This is not going to work with this dense treecover overhead and sadly but abviously: that's exactly the places where you can't see the paths in the original AND data :-(
Without trees it works okay.
Only when I have some new GPS machine or when the leaves have fallen, I will try this there again.
For now I'm already looking for places in my area that don't have a treecover, but are not yet in the map.
Also a pity that OSMtracker doesn't support VGA, that means everything works but the map. The only thing you'll see is the arrow, but no track appears. So, only when I download the trace I'll be able to see it.