Apollo MX20 User's Guide download pdf (Page 74)

Terrain (TER) Function

The Terrain Function shows a map of the terrain in the

area relative to your airplane’s position and altitude. The

MX20 has a standard internal based terrain function. The

MX20 also supports an external TAWS sensor. When the

external TAWS sensor is connected, it replaces the

MX20’s internal Terrain function.

Terrain information can be supplied by one of two

sources:

Internal MX20-Based Terrain

External TAWS-Based Terrain

Review the Limitations section on page iv for the

limitations that apply to the terrain data.

Internal MX20-Based Terrain

The altitude information comes from an external altitude

encoder. The displayed altimeter setting has to be

adjusted, or baro-corrected, just like the one in your

aircraft’s instrument panel.

The terrain screen has a 360-degree and a 120-degree

display. Both screens will show terrain relative to your

position. Colors used for terrain display are shown below.

Note

The Terrain function shows you the general

terrain elevations relative to your altitude

and are advisory in nature. Individual

obstructions may be shown if available in

the database. Terrain is displayed from

database information and may therefore

potentially contain some degree of error. Do

not use this information for navigation.

Detailed Operation

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Apollo MX20 User's Guide Page 74