[Therion] Overlay grid over maps

[Steven Tucker]

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
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