No, it's not free range on standard tracks.
No hunting in the vicinity of tracks is the actual wording on the permit if I recall correctly, and 500m from great walks.
I have no idea what the legal definition of "vicinity" is!
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I get cell coverage in some parts. Others are black out.
GPS doesn't require any cell phone signal. I alway keep airplane mode on. Saves battery.
But bring an actual GPS. They have a helical coil antenna which is better than the cell phones. Os of you're in a valley or thick Bush the phone might have trouble with the signal.