Garmin GI 275 Pilot's Manual page 243

6) Press the NAV Key on the GMC 507.
If there is less than half-scale deviation when the NAV Key is pressed, VOR Mode will
activate (green text), intercept, and track the selected radial. If there is more than half-
scale deviation when the NAV Key is pressed, VOR Mode will arm (white text) first, then
activate when closer to the radial.
7) Adjust the aircraft's pitch axis as required.
Localizer Approach (No GS)
LOC Mode is used to fly a localizer only approach (no glideslope).
Selecting LOC Mode for a localizer only approach:
1) EXTERNAL NAVIGATOR: Tune and activate the desired LOC frequency,
2) Ensure the 'LOC1' indication is showing in the lower-left corner. If not, press the CDI Key
on the navigator. The HSI should automatically slew the pointer to the correct course.
3) Press or the NAV Key on the GMC 507.
If the localizer deviation is less than half-scale when the NAV Key is pressed, the
autopilot will activate LOC Mode and track the localizer, otherwise LOC Mode is armed
and the pilot is responsible for intercepting the localizer. In some cases it may be
necessary to use HDG Mode with LOC Mode armed to follow a vector to the localizer.
GPS Approaches With Lateral + Vertical Guidance
Press the APR Key to arm/activate both lateral and vertical modes for approach. When
Glidepath (GP) Mode is armed for a GPS approach with vertical guidance, GPS Mode is
automatically armed. Press the APR Key when the CDI is greater than one dot to arm the
selected modes (annunciated in white). Press the APR Key when the CDI deviation is less than
one dot to activate, capture and track the selected navigation source.
Example Control
LPV, LNAV/
APR Key
VNAV,
LNAV+V
APR Key
LOC, ILS
190-02246-01 Rev. L
Modes Annunciation
Lateral: GPS GPS
Vertical:
Glidepath
Lateral:
LOC
Localizer
Vertical:
Glideslope
Lateral + Vertical Approaches
Garmin GI 275 Pilot's Guide
Description
Captures and tracks the lateral
portion of a GPS approach
Captures and tracks a WAAS
GP
approach glidepath
Captures and track the localizer
Captures and tracks the
GS
Autopilot
glideslope
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