190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. B Page 6-7
6.4.1.8 Display Update
The Display Update page (Figure 6-9) allows the installer to load the display software to the GTR/GNC.
Refer to Section 6.8 for instructions on how to load software to the GTR/GNC.
Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating
databases and software on the GTR/GNC.
Figure 6-9. Display Update Page
6.4.2 NAV Configuration (GNC Only)
6.4.2.1 CDI Indicator
The CDI Indicator page (Figure 6-10) allows the installer to configure 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 Instruments (EFIS) conforming to the
Garmin Serial Data Specification. See Appendix B.
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