Thanks for the help with this. The long term plan is to redo the entire survey, but for now a simpler solution was needed.
Bruce's suggestion of creating new centerline data from the old survey gave me an idea. After already redrawing the survey on therion and adding scale etc, I created a single fake shot from the entrance to the new point. Works perfectly and very quickly. Steven -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20150220/c342a16b/attachment.html>