> 
> 
> Some times when I digitise on screen, instead of coordinates
> comes up as I click I get "NaN", and when I finish digitising
> a get the message that only one point has been taken.
> 
> What am a doing wrong?
> 
> cheers   tom  8-)
> 
> 
> Tom Charnock                       O--O
> Dept Civil Engineering            (~~~~)
> Aston University                 (  __  )
> Birmingham B4 7ET UK             /|\  /|\
> charnotw@sun.aston.ac.uk
> 

Have you tried resetting the digitizing threshold?  
The digitizing threshold determines the valid distance
between two points for them to be considered as distinct
points.  If you are doing precise touch up work with the 
mouse, it is frequently below the threshold.  

The thresholds are under Customize, and are defaulted
to 0.03 inches (I think).  A 0.01 usually works for 
my needs.  I strongly suggest that you keep the snapping 
threshold the same value as the digitizing threshold.

-Sue Huse
REGIS
UC Berkeley


