Garmin GTN 625 Pilot's Manual page 157

6.11 ILS Approaches (GTN 650 Only)
Precision ILS approaches can be performed with the built-in VLOC (VOR/
localizer/glideslope) receivers. The GPS receiver can be used for guidance prior
to reaching the final approach fix, but once there, the proper frequency must
be selected on the VLOC window (right side of screen) and the CDI output set
to "VLOC."
NOTE: If you attempt to intercept the approach course at a distance less
than 2.0 NM from the FAF, the GTN 6XX does not automatically switch
the CDI to VLOC. In this case, touch the CDI key to manually switch from
GPS to VLOC.
190-01004-03 Rev. P
The GTN 6XX can be set to automatically
switch the external CDI output from GPS to
VLOC as you intercept the final approach
course (if used with a KAP140/KFC225
autopilot, you will need to manually enable
outputs. Refer to the instructions in the
"Enabling Autopilot Outputs for the King
KAP140/KFC225" section). When the ILS
approach is activated and the correct ILS
frequency is active in the VLOC window, the
GTN 6XX automatically switches to VLOC
within 1.2 NM left or right of the final
approach course. This switch can take place
anywhere from 2.0 to 15.0 NM from the
FAF.
The illustration shows multiple locations
along the approach path and the CDI
selection that you can expect: GPS or VLOC.
Within the area of the shaded box, the
automatic switch from GPS to VLOC should
occur.
GTN 625/635/650 Pilot's Guide
Foreword
Getting
Started
Audio &
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Direct-To
Proc
Wpt Info
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Appendix
Index
6-17