9-36
GTN 725/750 Pilot’s Guide
190-01007-03 Rev. C
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Charts
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
9.4 CDI (GTN 750 only)
The GTN 750's CDI key is used to couple the GPS or VLOC receiver to the
external CDI (or HSI). When the external CDI (or HSI) is connected to the GPS
receiver, “GPS” appears below the CDI key in the annunciation bar. When the
external CDI (or HSI) is being driven by the VLOC receiver, “VLOC” appears
instead.
NOTE: The external CDI (or HSI) must be coupled to the VLOC receiver for
approaches which are not approved for GPS. See the ILS example in the
Procedures section for more information.
NOTE: GPS phase of flight annunciations (LPV, ENR, etc.) are not applicable
to the external CDI (or HSI) when VLOC is active.
NOTE: The internal on-screen CDI information is based on GPS data and
cannot be used for primary navigation.
NOTE: If the unit is not configured for a CDI key, then the “activate GPS missed
approach” will only resume automatic waypoint sequencing. The user must
switch to GPS navigation, if desired, by using their external source selection
method (this is typical an EFIS system).
1. The navigation source is annunciated under the CDI key.
Touch CDI Key To Toggle
Navigation Source
Navigation Source
Annunciation
Figure 9-42 Navigation Source Selection
2. Touch the CDI key to toggle between sources.
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