Garmin G1000 Reference Manual page 67

In conjunction with the "TOD [top of descent] within 1
minute" annunciation in the Navigation Data Box, VNAV
indications (VNAV Target Altitude, vertical deviation, and
vertical speed required) appear on the PFDs in magenta
(Figure 6-11).
HSI Set to GPS
Altitude Hold Mode Active
Figure 6-11 Vertical Path Capture
Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
SECTION 6 – AUTOMATIC
FLIGHT CONTROL
Vertical Path Tracking Armed, (Flashing Indi-
cates Acknowledgment Required)
VNAV Target
Altitude
Selected Altitude Below
VNAV Target
Vertical Deviation
Indicator
Required Vertical
Speed Bug
Enroute Phase of
Flight
6-11