Apollo MX20 User's Guide download pdf (Page 45)

Terrain

The Terrain option allows you select the display of

topographical features. Pressing the

LINE SELECT key

next to the Terrain option toggles between sectional

(absolute), terrain awareness (relative), or no display of

topographical features. The sectional (absolute) display

shows a display similar to a sectional map. The terrain

awareness (absolute) display shows a color coded view

where the colors relate to terrain elevation relative to your

altitude. For more information about the terrain

awareness option, see the Terrain function section on

page 64. When you turn the Terrain feature off, the

background is either black or white depending on your

selection in the Invert option. When no terrain data is

available, the missing areas will be shown in light blue.

Water will not be shown in relative mode. Review the

Limitations section on page iv.

Obstructions

Obstructions, such as towers and other man-made objects,

are part of the MX20 updateable database. Obstructions

over 250 feet high are shown on the maps with tower

symbols. The symbol is color coded to signify the relative

altitude of the tower to your aircraft’s altitude and follows

the same conventions as the color coding for terrain.

Objects that are at your altitude are shown in red; objects

that are near your altitude are shown in yellow; objects

with towers that are significantly below your altitude

colored green. Obstructions are shown on the Custom

Map and in the Terrain function. For info on color

coding, see the section about the Internal MX20-Based

Terrain on page 64. Review the Limitations section on

page iv.

Current coverage for obstructions is North America only

and are drawn only when the zoom level is below 50nm.

Detailed Operation

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Apollo MX20 User's Guide Page 45