"or 2,000 feet above the highest ground within 100 nautical miles." would be the relevant statement. I would read that as if they are within a 100 miles of Mt Erebus they would not be below FL160. Erebus I recall was 13,280ft, but changing slightly with time.
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That would be my interpretation, but I stand to be corrected if need be.
Last edited by prospector; 5th Dec 2019 at 00:09.
Reason: An addition