Inter Chart Relationship Diagram

T-6A NAVIGATION

CHAPTER ONE

Operational Navigation Chart Published By National Imagery And Mapping Agency

Scale:

1:1,000,000

Code: ONC

(1 inch = approximately 14 nautical or 16 statute miles)

Latitude 0o to 80o. Lambert

Projection:

Conformal Conic. Latitude 80o to 90o:

Polar Stereographic.

Size:

41 5/8 inches x 57 1/2 inches

Purpose:

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.

Style:

Partial margin, multi-color, pictorial relief.

Information Shown:

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.

Culture:

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.

Vegetation:

Stable vegetation pattern.

Aeronautical: Aerodromes and stable aeronautical facilities.

CHART LEGEND REVIEW

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