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As far as I am aware true South for Perth is around 178 degrees (178.66)
Easy way to align your scope is make a perfectly angled (90) T piece the dimensions of the tripod legs spread fully tensioned. Make the T piece long end a point put a nail as few inches below the point dead centre of the timber. Place the T piece on the ground point the long end south using the compass to find true South sighting with the nail then align the legs with the T piece points.
Level the head using the bubble or a plumb bold aligned vertically with the T piece.
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