Enroute High Altitude charts (HI) depict aeronautical navigation information, airways system, special use airspace, communication stations critical for flight in the high level structure. Vertical coverage is from 18,000′ asl and above. 6 charts (3 sheets back-to-back). Set of ( H 1/2, H 3/4 and H 5/6).
Effective 25 February 2021 to 22 April 2021
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