[Aces High (Mark)]

My yard and surroundings have created a problem for my new Goto HE5Pro mount.

I have two old fashion compass's and a digital compass app on my phone.
My problem is I'm having trouble finding "true South".

The yard where I use my scope is surround by a steel fence, power cables over head etc.

I can move any of the compass around and get ten different readings.
The digital app is set to True south and still it gives different readings.

I'm told there is stick, shadow, midday sun method but not sure where to find a updated link to exactly how to do this. Plus at the moment it is overcast with a threat of rain. LOL

Any help appreciated. I'm in Bankstown, Sydney.