Operational Navigation Chart Published By National Imagery And Mapping Agency
(1 inch = approximately 14 nautical or 16 statute miles)
Latitude 0o to 80o. Lambert
Conformal Conic. Latitude 80o to 90o:
41 5/8 inches x 57 1/2 inches
Designed primarily for preflight planning and high to medium altitude enroute
navigation by dead reckoning, visual pilotage, celestial, radar, and other electronic
techniques. The ONC is also used for operational planning, intelligence briefing,
and plotting, as well as for flight planning wall displays. These charts replace
World Aeronautical Charts in areas of duplicate coverage.
Partial margin, multi-color, pictorial relief.
Contours (generally 200 or 250 feet to 1000 feet intervals), spot elevations, three
dimensional relief shading, terrain characteristics tints and maximum elevation
data. Colors on this chart are functional. Green indicates flat or relatively level
areas regardless of the altitude above sea level. Level areas at higher elevations
(plateaus) are shown by yellow-green. Light buff and yellow color indicates hilly
and rolling to mountainous terrain. Two bands of dark yellow at higher elevations
identify major mountain ranges and/or critical mountain tops.
Extensive cities and towns, power transmission lines, principal roads, detailed
railroad network, boundaries, and miscellaneous cultural features. Checkpoint
and obstruction data is emphasized.
Hydrography: Water tint, detailed drainage.
Stable vegetation pattern.
Aeronautical: Aerodromes and stable aeronautical facilities.
CHART LEGEND REVIEW