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6-16
Garmin GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. B
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
•IftheCDIoutputhasnotautomaticallyswitched from GPS to ILS upon
reaching the FAF, you must manually switch to the VLOC receiver by
touching the CDI key. Verify that “VLOC” is displayed.
•AutomaticswitchingofCDIoutputisavailableforILS,localizer,SDFand
LDA approaches. Automatic CDI switching is not available for backcourse
approaches or VOR approaches.
•Whenyinganapproachwiththeautopilot-coupled,youmustmonitor
system functions at all times and verify that the autopilot and external CDI
(or HSI) switch to the VLOC receiver with sufficient time to capture and
track the approach course. Switching to “VLOC” late in the approach may
not provide the autopilot enough time to respond and intercept the approach
course prior to the FAF (depending upon the performance characteristics of
your autopilot and aircraft). In such instances, you should manually fly the
approach or refer to the documentation provided with your autopilot.
•WhenanILSorVORapproachisrstselectedorexecuted,thefrequency
is automatically checked. If the frequency is incorrect, you will receive a
message and you must place the correct ILS or VLOC frequency in the
active frequency field.
•When ying a localizer-based approach (other than backcourse) with
automatic CDI switching enabled:
1. “GPS” guidance may be used while flying outbound and on
the initial portion of the procedure turn.
2. “VLOC” guidance is used on the remainder of the approach
from the time you turn inbound on the procedure turn.
3. The localizer frequency must be active to use “VLOC” guidance
at the MAP.
•When ying a localizer-based approach with automatic CDI switching
disabled.
1. You may select “VLOC” guidance at any point on the approach
prior to reaching the FAF.
2. The localizer frequency must be active to use “VLOC”
guidance.