I have no time to explore it right now, but there is flag arch of point station. What about to create dummy data nosurvey stations with flag arch and define excavation grid by that? m.s. On Sep 27, 2017, at 11:44 AM, Andrew Atkinson via Therion <therion@speleo.sk> wrote: I've not used it myself but there is an option grid-angle <value> <units> ▷ specifies the magnetic grid angle (declination against grid north). page 19 of the thbook for details Andrew On 25/09/17 06:12, Steven Tucker via Therion wrote: Good day everyone, I am in the process of remapping a large cave in which there are various archaeological / paleontological excavation areas. In one chamber of the cave an excavation grid has been setup. The excavation grid's north is 23 degrees east of true north. Magnetic north is 18 degrees west of true north. So if I put "grid bottom" into my layout I get a grid on my pdf output which is oriented to magnetic north. Is there a way to orientate this grid to 23 degrees east of true north? Thanks, Steven _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion