Nick This may or may not help, but you have stumbled, in part, into a topic I explored back in July 2017 (if seems much longer than that), with mixed feedback! https://www.mail-archive.com/therion@speleo.sk/msg06555.html At the time I made some changes based on feedback received. I have not looked at it for a while, but have attached the file in its current state, with changes tracked. It is still a bit rough I'm sorry. Bruce From: Therion <therion-bounces@speleo.sk> On Behalf Of Nick Bairstow via Therion Sent: Friday, 2 March 2018 11:01 PM To: List for Therion users <therion@speleo.sk> Cc: Nick Bairstow <Nick@pff.uk.com> Subject: Re: [Therion] Error When Adding A new Cave to Master Index OK as is normally the case with these things I spotted the error within five minutes of asking for help, but it has raised a another question. My problem was quite simply I had no survey/end survey wrapper. I have been using this index file for over two years and never noticed however it has worked perfectly and produced what I needed. I now ask why did the index.th compile OK with the other 18 surveys listed in it. The only difference between the first 18 surveys and the last non-working one was that in each scrap of the 18 previous surveys I used the option -station-names "" "@surveyname". I was shown this when I started learning Therion but never really new why. When using this option to make any survey.th compile I have to make sure the map/endmap is outside the survey/endsurvey wrapper. With the my latest survey file I did not use the scrap option and just went with the "normal way" with everything in survey.th within the survey/endsurvey and then the index .th failed due to having no survey/endsurvey wrapper. Clearly I do not yet fully understand the process even though I can make things work, so lots more reading I think. Does anyone know of a good explanation somewhere, most thing I read I find a little confusing. Also if someone would like to explain the -station-names "" "@surveyname" bit I would be very grateful. I suspect I'm not the only one to have struggled with this. Thanks for the previous answers guys. Nick From: Therion [mailto:therion-bounces@speleo.sk] On Behalf Of Bruce Mutton via Therion Sent: 01 March 2018 19:23 To: 'List for Therion users' <therion@speleo.sk <mailto:therion@speleo.sk> > Cc: Bruce Mutton <bruce@tomo.co.nz <mailto:bruce@tomo.co.nz> > Subject: Re: [Therion] Error When Adding A new Cave to Master Index Nick I'm guessing you have created a map that contains the survey only for your new cave, and a map which contains scraps or maps for your other caves. I do this intentionally while I am drawing up a new piece of passage, then remove the survey map once I am finished. Bruce From: Therion < <mailto:therion-bounces@speleo.sk> therion-bounces@speleo.sk> On Behalf Of Nick Bairstow via Therion Sent: Friday, 2 March 2018 7:38 AM To: List for Therion users < <mailto:therion@speleo.sk> therion@speleo.sk> Cc: Nick Bairstow < <mailto:Nick@pff.uk.com> Nick@pff.uk.com> Subject: [Therion] Error When Adding A new Cave to Master Index I have just added a small cave to my main index .th. Everything compiles but the pdf shows the new cave as shots and splays not as the normal walls etc you would expect in a map. All other caves display correctly as intended. Has anyone point out what I am doing wrong. Nick