hi bruce, i had a similar problem once, but it was in a pit with plenty of water, and on the spot i thought it was due to the water splashing around ...
> >were all the "wrong" values exactly the same, or just similar ? > As above, I don't know - I had assumed they would be 'identically > incorrect'. > > >did it happen long ago, or recently ? > Saturday 22 January 2011 NZ daylight time. > so this is probably the last survey in the distox memory, and it is still there. just for curiosity (and record), could you dump it ? [can prepare for you a win32 app to do that] does pockettopo save to file the raw data exchanged with the distox ? marco