Interperation of the Chart Legend

T-6A NAVIGATION

CHAPTER ONE

Tactical Pilotage Chart Published By National Imagery And Mapping Agency

Scale:

1:500,000

Code: TPC

(1 inch = approximately 7 nautical or 8 statue miles)

Latitude 0o to 80o. Lambert

Projection:

Conformal Conic. Latitude 80o to 90o

Polar Stereographic.

Size:

41 5/8 inches x 57 inches.

Purpose:

Used for detailed preflight planning, mission analysis and low to medium altitude

navigation. Significant ground features are portrayed to facilitate chart to ground

orientation at predetermined checkpoints for low-level, high-speed navigation.

Style:

Partial margin, multi-color, pictorial relief.

Information Shown:

Relief:

Basic contour interval is 500 feet with 250 foot intermediate contours and 100

foot auxiliary contours in moderately level areas; spot elevations throughout the

various elevation levels; three dimensional relief shading and with or; layer tints

and land forms significant to low-altitude radar missions.

Culture:

Extensive towns and cities, principal roads, detailed railroad network, power

transmission lines, pipelines, boundaries, and cultural features selected for rapid

visual recognition form a low perspective angle. Checkpoint features are

portrayed by three-dimensional pictorial symbols.

Hydrography: Detailed drainage, shoreline vignetted.

Vegetation:

Areas of perennial vegetation shown by symbol and vignetted in green.

Aeronautical: All aerodromes and stable aeronautical facilities symbolized: Major aerodromes

with hard-surfaced runways of 3,000 feet or more are shown by runway pattern,

and vertical obstructions 200 feet or more above ground level elevations are

shown.

INTERPRETATION OF THE CHART LEGEND

The chart is not a true picture of the real world, but rather a schematic diagram of certain

characteristics of the world. When someone looks at a schematic diagram of a radio, they

understand they are not looking at a facsimile of the radio itself. In a similar fashion, one should

realize the chart is not a facsimile of the earth's surface. It is a stylized, simplified, generalized,

and codified presentation of selected characteristics of the earth's surface. These charts are

CHART LEGEND REVIEW

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