Garmin MX20 Installation Manual page 44

Installation
MX20, i.e., the GX should be configured to output Moving Map data. If the altitude data is
supplied from a GX model unit, it must have extended mode enabled.
5. Check the System Info page on the MX20 to verify that the data is available to each port and that it
is being processed properly.
6. Verify ALT data flag is not displayed in the lower left portion of the MX20 display.
7. With external navigation source off, the POS and RTE data flags should be present.
The external navigation source may need to be properly configured prior to this step.
Direct To sequence may need to be entered for external navigation source to output POS
and RTE.
If an internal GPS exists, it can also provide a valid position to the MX20.
8. Turn the external navigation source power on. Verify that the navigation source acquires a
position.
9. Create/activate a flight plan on the external navigation source.
10. Verify the RTE and POS data flags are not displayed.
11. Flight plan will be displayed on the MX20 on the FPL page, if the FPL function is enabled.
12. Turn the traffic source power on. Verify the TCAD, XPDR, or TRAF data flags are not displayed.
The ADSB data flag may be displayed if the GDL 90 is installed. The ADSB flag indicates that the
GPS receiver in the GDU 90 does not have a valid position. This flag is acceptable for this check
out procedure. If the ADSB flag appears when a traffic sensor other than the GDL 90 UAT is
installed, verify that the GDL 90 options in the Install-Misc menu are disabled.
13. With the Lightning sensor turned off, verify that the LT data flag is displayed.
14. Turn the Lightning sensor power on. Verify that the LT data flag is not displayed.
15. With the GDL 69/69A sensor, if installed, turned off, verify that the XM data flag is displayed.
16. Turn the GDL 69/69A sensor is on. Verify that the XM data flag is not displayed.
17. With the WSI InFlight sensor, if installed, turned off, verify that the Link data flag is displayed.
18. Turn the WSI InFlight sensor on. Verify that the Link data flag is not displayed.
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NOTE
560-1025-09 Rev E MX20 Installation Manual