USAHI-20 - Initial Full USA - Enroute High Chart Service
USA Enroute High Only. Coverage - initial and revision - fits in one 1-inch binder (sold separately).
USAHS-20 - Initial Full USA - Enroute High Supplement Chart Service
USAHS is the same as the USAHI except it also includes special north/south oriented charts covering the eastern third of the country and a High Altitude Area chart for the congested New York area. Coverage - initial and revision - fits in one 1-inch binder (sold separately).
USA Enroute High Only. Coverage - initial and revision - fits in one 1-inch binder (sold separately).
USAHS is the same as the USAHI except it also includes special north/south oriented charts covering the eastern third of the country and a High Altitude Area chart for the congested New York area. Coverage - initial and revision - fits in one 1-inch binder (sold separately).