Garmin G1000 NXi Pilot's Manual page 370

AUTOMATIC FLIGHT CONTROL SYSTEM
Prior to descent path interception, the Selected Altitude must be set below the current aircraft altitude
by at least 75 feet. For the flight director to transition from Altitude Hold to Vertical Path Tracking Mode,
acknowledgment is required within five minutes of descent path interception by:
• Pressing the VNV Key
If acknowledgment is not received within one minute of descent path interception, the white 'VPTH'
annunciation starts to flash. Flashing continues until acknowledged or the descent path is intercepted. If
the descent is not confirmed by the time of interception, Vertical Path Tracking Mode remains armed and
the descent is not captured.
In conjunction with the "TOD [top of descent] within 1 minute" annunciation in the PFD Navigation
Status Box and the "Vertical track" voice message, VNV indications (VNV Target Altitude, vertical deviation,
and vertical speed required) appear on the PFD in magenta.
GPS is Selected
When a descent leg is captured (i.e., vertical deviation becomes valid), Vertical Path Tracking becomes
active and tracks the descent profile. An altitude capture mode ('ALTS' or 'ALTV') is armed as appropriate.
356
Altitude Hold
Enroute
Navigation Phase of
Source Flight
Figure 7-15 Vertical Path Capture
Garmin G1000 NXi Pilot's Guide for the Cessna Nav III
• Adjusting the Selected Altitude
Vertical Path Tracking
Armed (Flashing Indicates
Mode Active
Acknowledgment Required
Vertical
Deviation
Indicator
VNV Target
Altitude
Selected
Altitude
Required
Vertical
Speed Bug
190-02177-00 Rev. A