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8-29190-01004-03 Rev. B
Garmin GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
8.4 CDI (GTN 650 only)
The GTN 650's CDI key is used to couple the GPS or VLOC receiver to
the external CDI (or HSI). CDI selection is available on the Default Navigation
page. When the external CDI (or HSI) is connected to the GPS receiver, “GPS” is
shown on 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 shown in the center of the annunciation
bar at the lower part of the display.
Touch CDI
Key To Toggle
Navigation
Source
Touch To Access
Map Page
Navigation
Source
Annunciation
CDI Display
Touch OBS
Key To Toggle
OBS Mode
GPS Level
Of Service
Touch To Edit FPL
Figure 8-38 Navigation Source Selection
2. Touch the CDI key to toggle between sources.