Garmin MX20 Installation Manual - page 35
Installation
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MX20 Installation Manual
c. Enable XM Satellite Radio if a GDL 69A is installed. This should be disabled if a GDL 69 is
installed.
d. Enable Flight Plan to allow viewing of flight plan route lines on the display.
e. Enable Terrain only if an altitude encoder is installed, either directly or through a navigation
source, or if a TAWS sensor is installed.
3. Press the Next Page line select key to view additional functions.
a. Enable Lightning only if WX-500 is installed.
b. Enable the System function to allow viewing of the System function.
c. Enable Radar only if a unit is an I/O model and interfaced to a radar unit.
4. A typical installation will have all functions enabled except those noted above based on what
hardware is installed in the aircraft.