As you’ve surmised, directions here are a bit weird because every way is north (using the normal way people reckon directions).
To get around the problem they use a grid system. Take a map of Antarctica. Orient it so that 0 degrees longitude is pointing ‘up’ and overlay a grid on the South Pole. Zero longitude is grid north, 180 degrees is grid south. 90 degrees clockwise from north (90E) is grid east.
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