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As I mentioned in my previous post , solar noon shadow method to find “True South” never fails anywhere in the Southern Hemisphere
Cost nothing, takes a few minutes to set up and is very accurate as long as your accurate with your set up ,timing and marking
I’ve used expensive Silva compasses with magnetic deviation all of which have been inaccurate , they are a moving target dependant on the composition of the regolith ( iron ) in the area ( I observe and image from 2 different locations 220km apart )
Cheers
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