Garmin G1000 Reference Manual page 73

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) appears on the PFD in magenta
(Figure 6-11).
GPS is
Selected
Navigation
Source
190-00384-09 Rev. A
Altitude Hold
Mode Active
Terminal
Phase
of Flight
Figure 6-11 Vertical Path Capture
Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
Vertical Path Tracking Armed,
(Flashing Indicates Acknowledg-
ment Required)
Selected
Altitude Below
VNV Target
Vertical
Deviation
Indicator
SECTION 6 – AUTOMATIC
FLIGHT CONTROL
VNV Target
Altitude
Required
Vertical
Speed Bug
6-11