The NT have the right to charge admission to property in their care however, and I am sure someone will correct me on this one, I always understood the shore between MLWS and MHWS was Crown property and the adjacent land "owners", or should one say "carers" as in the case of the NT, had no jurisdiction on this inter-tidal zone. If this is the case, provided you did not cross the MHWS line the NT would have no jurisdiction over you whatsoever. Bearing in mind the laws up here in God's country are different from those south of the border in England and Wales (or even Cornwall).
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"Artificial intelligence is no match for natural stupidity"