I'm working on an extended elevation for a short cave that has 10 loops and I'm having trouble getting the extended elevation that I would like. I suspect that it would be easier if I placed the extend statements in each of the survey data centrelines where the legs are enumerated, but instead I am trying to put the extend statements in a separate file dedicated to extended development (described in https://therion.speleo.sk/wiki/extend ) So I may be the author of my own torment. Anyway I persist; I may have found a bug and I have a request to augment the 'log extend' feature: The bug - Extend appears to (re)START at the end of splay shots #432 <https://github.com/therion/therion/issues/432> The feature request - Can log extend echo status for legs that have been hidden #433 <https://github.com/therion/therion/issues/433> Thanks Bruce