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You are at 45°N mid-Atlantic, outside A1/A2, with only a legacy Inmarsat-C. Inmarsat-C goes DOWN for maintenance for 12 hours. During that window, your effective sea area is:
A
Still A3 because coverage returns later
B
A4 for the duration, because A3 requires continuous…
C
A2 via MF sky-wave
D
Not defined