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? Steve
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