Thanks guys.

Yes, I am doing as Footleg suspected and importing already generated
survex.3d files in this case. That's partially to save time, as I seem to be
on a deadline with this, strange feeling for a survey project, and that's
the way much of the data is getting to me. I have also been given some data
in Compass.dat files & I can import that into Survex to generate a .3d but
I've been never been able to get it to import directly into Therion. Does
it?

I could convert the data to Therion but that's time consuming to get right &
as I said, I seem to have a deadline on this.

However, thanks to Footleg I now know which version of Survex to use. I'd
gone all the way back to 1.1.15 just to make sure it worked!

Graham

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