Points To Remember For Localizer Or Vor-Based Approaches - Garmin GTN 725 Pilot's Manual

6.13
Foreword
Getting
• The default factory setting allows the CDI output to automatically switch
Started
from the GPS receiver to the LOC receiver. This may be changed to manual
Audio &
in some installations. If the "ILS CDI Selection" setting is changed to
Xpdr Ctrl
"Manual", you must determine when to select "GPS" or "VLOC" guidance
Com/Nav
during the approach. Remember, "VLOC" is required for the final course
segment from Final Approach Fix (FAF) to MAP.
FPL
NOTE: Installations with certain autopilots, such as the KAP 140 and
Direct-To
KFC225, do not allow automatic ILS CDI switching.
Proc NOTE: GPS phase of flight annunciations (LPV, ENR, etc.) are not applicable
to the external CDI (or HSI) when VLOC is active.
Charts
• If the CDI output has not automatically switched from GPS to ILS upon
reaching the FAF, you must manually switch to the VLOC receiver by
Wpt Info
touching the CDI key. Verify that "VLOC" is displayed.
Map
• Automatic switching of CDI output is available for ILS, localizer, SDF and
LDA approaches. Automatic CDI switching is not available for backcourse
Traffic
approaches or VOR approaches.
• When flying an approach with the autopilot-coupled, you must monitor
Terrain
system functions at all times and verify that the autopilot and external CDI
Weather
(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
Nearest
not provide the autopilot enough time to respond and intercept the approach
course prior to the FAF (depending upon the performance characteristics of
Services/
Music
your autopilot and aircraft). In such instances, you should manually fly the
approach or refer to the documentation provided with your autopilot.
Utilities
• When an ILS or VOR approach is first selected or executed, the frequency
is automatically checked. If the frequency is incorrect, you will receive a
System
message and you must place the correct ILS or VLOC frequency in the
Messages
active frequency field.
• When flying a localizer-based approach (other than backcourse) with
Symbols
automatic CDI switching enabled:
Appendix
6-20
Index
Points to Remember for Localizer or
VOR-based Approaches
Garmin GTN 725/750 Pilot's Guide 190-01007-03 Rev. D