On 1 Jan 2010, at 13:07, Steve Bennett wrote: > I've got a trace from today which is significantly out of sync with a path I > traced from Nearmap: > > http://www.openstreetmap.org/edit?lat=-37.880138&lon=145.193417&zoom=19&gpx=594988 > > The trace looks like I was wandering through the grassy paddock, but I was > actually following exactly that northern most "highway=path" in the bush. So > it looks like the trace is incorrectly recorded something like 50m north of > where I actually was. Now, since the discrepancy seems to go away on that > track a bit further east (later chronologically), presumably the explanation > is the GPS data is faulty. Is this common? I'm new to GPSing, so I'm just > surprised. It's a Garmin Oregon 550. Is there anything I can do to reduce, or > at least detect, such errors?
It is very common for GPSs to give errors for whatever reason. Interference is very common from things like buildings. Newer units are less likely to have an issue. You simply need to go along that track again a few times to get an averaged out reading. Shaun
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