[Dennis]

Although I don't do this any longer, (as I have three fixed registration marks in the back garden), I used to align the polar axis with the green line in the attached image. This would place the four stars of Octans, one of which is Sigma Octans, in the FOV of my Polar Alignment Scope where I would then align more accurately by adjusting the Alt Az knobs of the GPDX mount.

Edit:
I have just added a scan of a Brisbane map, (coincidentally showing Cambroon, Ron's location) which graphically shows the relationship between Grid North (GN), True North (TN) and Magnetic North (MN).

This appears to indicate that when the compass needle is pointing N on the previous photo of the compass, (=0 deg), then we need to subtract 11 deg, which gives 349 degrees.

We then set this 349 deg at the “READ BEARING HERE” mark and let the compass point to N as shown by the rotating pointer at the “N” mark in the white outer bezel. Then, the True North line will be along the green line.

At least I think that is correct? Corrections welcome and gladly accepted!

Cheers

Dennis