UIS grades - update

[Peter MATTHEWS]

It may also be useful to check out the Australian cave survey and mapping 
grades, which were produced by a group led by Ted Anderson, and including 
myself, in 1978. The grades have been kept as compatible as possible with 
the BCRA grades but their scope is wider and they deliberately group 
compatible precisions of length and horizontal and vertical angles based on 
the expected short shots taken in a typical cave survey.

You can see them on the web at:
http://www.caves.org.au/standards/mapping/stdsurv.html#9.0

Peter Matthews