Garmin G1000 Pilot's Manual page 343

APPROACH MODE (GPSa, VAPP, LOC)
The selected navigation receiver must have a valid VOR or LOC signal or active GPS course for the
NOTE:
flight director to enter Approach Mode.
Approach Mode is activated when the APR Key is pressed. Approach Mode acquires and tracks the selected
navigation receiver (GPS, VOR, or LOC), depending on loaded approach. This mode uses the selected
navigation receiver deviation and desired course inputs to fly the approach. VOR Approach Mode (VAPP)
provides greater sensitivity for signal tracking than VOR Navigation Mode.
Pressing the APR Key when the CDI is greater than one dot arms the selected approach mode (annunciated
in white to the left of the active roll mode). If the selected navigation receiver is GPS, pressing the APR Key
arms GPS Approach Mode, provided that a GPS approach has been loaded into the flight plan. If the loaded
approach provides WAAS-based vertical guidance, Glidepath Mode is also armed (see Figure 7-16). If GPS
Approach Mode is selected while in GPS Navigation Mode, capture can occur with crosstrack error of up to
2 nm.
LOC Approach Mode allows the autopilot to fly a LOC/ILS approach with a glideslope. LOC Approach
Mode is armed (along with Glideslope Mode; see Figure 7-18) when the APR Key is pressed and either of the
following have been done:
• Navigation source is set to LOC
• A LOC/ILS approach is loaded into the flight plan and the corresponding localizer frequency tuned and the
selected navigation source is GPS (in this case, localizer capture is suppressed until the navigation source is
changed to LOC)
If Approach Mode is active and either of the following occur, the flight director reverts to Roll Hold Mode
(wings rolled level):
• Vectors-to-Final is activated
• Navigation source is manually switched
• The FAF is crossed while in GPS Navigation Mode after the automatic navigation source switch from GPS
to LOC
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HANGING THE
The Selected Course is controlled using the CRS Knob (while in VOR, LOC, or OBS Mode). Pressing the
CWS Button and hand-flying the aircraft does not change the Selected Course while in Approach Mode.
The autopilot guides the aircraft back to the Selected Course (or GPS flight plan) when the CWS Button is
released.
190-00498-01 Rev. A
Figure 7-24 GPS Approach Mode Armed
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ELECTED OURSE
Garmin G1000 Pilot's Guide for Cessna Nav III
AUTOMATIC FLIGHT CONTROL SYSTEM
7-25