Thanks for the comments, everyone. In all my playing with nearmap, I have little reason to doubt their accuracy. There are a couple of little seams here and there, but nothing more than a couple of metres. Giving the way this trace here meanders all over the place, I'm pretty confident that the nearmap data is a safer bet than the trace - but I'll be paying more attention to accuracy in the future.
Btw, can everyone actually see the trace in the URL I referred to ( http://www.openstreetmap.org/edit?lat=-37.880138&lon=145.193417&zoom=19&gpx=594988- then press G)? I'm a bit uncertain about the different privacy settings in Potlatch. Steve
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