Effective October 5, 2023 to November 30, 2023

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).