190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 6-7
6.4.1.8 Display Update Page
The DISPLAY UPDATE page loads the display software to the GTR/GNC. See section 6.8 for
instructions on how to load software to the GTR/GNC.
Figure 6-9 Software Update Page
6.4.2 NAV Configuration Group (GNC Only)
6.4.2.1 CDI Indicator Page
The CDI INDICATOR page configures the type of Course Deviation Indicator (CDI) that is connected to
the GNC. The setting is based upon the connected CDI. See table 6-6 for settings.
Figure 6-10 CDI Indicator Page
Table 6-6 CDI Indicator Selections
Selection Description
NONE (DEFAULT)
No external resolver is supported. OBS mode allows the user to edit the
OBS with concentric knobs. Serial OBS update messages are supported in
this mode, but the unit will not flag if updates are discontinued or are not
periodic.
RESOLVER
Auto-decodes resolver setting via six-wire resolver interface. Uses internal
DSP to compute course information. See section 6.5.1 for calibration.
CONVERTER
Disables all internal OBS functions. Allows use of conventional external
converter via the composite output pin.
SERIAL
For use with serial Electronic Flight Instrument System (EFIS) conforming
to the Garmin serial data specification. See appendix B.
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