Hi Martin and Tarquin, I have now redefined the subsurveys correctly, however it's now got an error on the thconfig file. Error C:\Program Files (x86)\Therion\therion.exe: error -- thconfig [16] -- object does not exist -- tpv writing xtherion file ... done But as far as I know I defined the map tpv on the .th file. I've been round in a circle before commenting out parts. If I comment out tpv from both .th and config file, then I get the same message with just "lower". Error error -- thconfig [18] -- object does not exist -- lower Regards, Alastair Gott. AlastairGott@hotmail.com, M: 07931779380. ________________________________ From: Therion <therion-bounces@speleo.sk> on behalf of Martin Sluka via Therion <therion@speleo.sk> Sent: 07 May 2019 07:26 To: List for Therion users Cc: Martin Sluka Subject: Re: [Therion] Maps of maps at lower level in survey tree 6. 5. 2019 v 23:48, alastair gott <alastairgott@hotmail.com<mailto:alastairgott@hotmail.com>>: map tpv TotalperspectivevortM break Vortex2M endmap map lower TotpersfromfingerM endmap TotalperspectivevortM is scrap, isn’t it. But that scrap is part of namespace Totalperspectivevort of survey Totalperspectivevort defined in file Totalperspectivevort.th<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftotalperspectivevort.th&data=02%7C01%7C%7Cb1b950e4fdca48063d3b08d6d2b4f6bb%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636928072002282895&sdata=WKj8RhBKVT9%2BzUu6%2Ftcmo1To5XPTGHNHAF%2Btb0LTXl0%3D&reserved=0> Therion must know the way to all objects to work with. If not, it sends message as in your case "Fingernailviatpvtovortex2.th<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ffingernailviatpvtovortex2.th&data=02%7C01%7C%7Cb1b950e4fdca48063d3b08d6d2b4f6bb%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636928072002292906&sdata=RTsEnuz4TK9M0Mt%2FpNFD63smyaU2EzH7QMtCKgLewNk%3D&reserved=0> [9] -- object does not exist -- TotalperspectivevortM„. It means on 9th line of file Fingernailviatpvtovortex2.th<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ffingernailviatpvtovortex2.th&data=02%7C01%7C%7Cb1b950e4fdca48063d3b08d6d2b4f6bb%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636928072002302911&sdata=eYCLCWDNIULi4v%2BlbEhDe6PGw7GmSKIz%2BV%2BhjIDi6GU%3D&reserved=0> is object TotalperspectivevortM but Therion doesn’t know the way to it. You defined the station in equate command correct - 1.2@Totalperspectivevort (station_name@name_space) Use the same way in your map definition map tpv TotalperspectivevortM@Totalperspectivevort break Vortex2M@Totalperspectivevort endmap Note: I after years started to name maps as xxxxxxxxx.map and scraps as nnnnnnnnnnnn.scrap just to see what is the object listed in definitions. Martin Sluka