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Central Australia is full of iron ore and your compass not matter how well designed will always be affected by magnetic flux. As soon as you take a compass measurement take the compass away and then redo that measurement again I guarantee the two will be different
The only sure way to align your tripod as close as possible to true south is to use solar noon and a shadow stick.Then set the altitude on your mount to local latitude using a digital inclinometer (eg: Accumaster )
I use it at various locations and get to within a few degrees of the pole, then polar aligning is fairly quick after that.
The sun never fails you , no matter where you are
Initially tried compasses of all types many years ago and gave up ( sold them ) ended up to far away from true south
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