Garmin G900X Pilot's Manual - page 264
GPS NAVIGATION
190-00726-00 Rev. A
5-106
Garmin G900X Pilot’s Guide
Stay AT or ABOVE 5,000 ft
Stay AT or BELOW 3,000 ft
Stay AT 2,300 ft
Figure 5-88 Altitude Restrictions
Note: Vertical constraints and along track offset waypoints are not retained in stored flight plans.
Enabling/Cancelling VNV guidance:
1)
Select the Active Flight Plan Page.
2)
Select the
CNCL VNV
Softkey. Canceling VNV results in VNV outputs V DEV (vertical deviation), VS REQ
(vertical speed required), and TIME TO TOD/BOD (time to top of descent/bottom of descent) going invalid. As a
result the non-numeric vertical deviation and VS REQ indicators on the PFD are removed. Additionally the V DEV,
VS REQ, and TIME TO TOD displayed in the Current VNV Profile box on the Active Flight Plan Page is dashed.
Once cancelled, VNV remains disabled until manually enabled or a direct-to waypoint is entered while in
reversionary mode. When cancelled the
CNCL VNV
Softkey changes to ENBL VNV. VNV can be enabled
by selecting the
ENBL VNV
Softkey causing a VNV waypoint to be selected (if possible) and vertical
navigation to resume.
ALTITUDE CONSTRAINTS
The G900X provides a means to enter altitude constraints associated with waypoints in the active flight
plan so long as the waypoint is not the final approach fix, a waypoint after the FAF, or part of an unsupported
lateral leg type.
Altitude constraints are displayed and entered in mean sea level (MSL) values to the nearest hundreth. An
altitude constraint in above ground level (AGL) format is supported for airports. To convert the value to AGL,
turn the
FMS
Knob when MSL is highlighted and press the
ENT
Key. When a database altitude restriction is
displayed, the G900X allows user entry of a different altitude when creating a waypoint, effectively overriding
the database restriction (only before the FAF). The G900X allows activation of a displayed database altitude
restriction by highlighting the database constraint and pressing the
ENT
Key. When a database altitude
restriction of type “AT or ABOVE” or “AT or BELOW” is activated, the G900X uses the “AT” portion of the
restriction to define the vertical profile.
The G900X annunciates all constraints that cannot be used to calculate vertical guidance by displaying the
value in halftone, light blue text. The following conditions constitute an invalid altitude constraint:
• Meeting the constraint requires the aircraft to climb
• Meeting the constraint requires the maximum flight path angle to be exceeded
• Meeting the constraint requires the maximum vertical speed to be exceeded
• The altitude constraint results in a TOD behind the aircraft present position
• The constraint is within a leg type for which altitude constraints are not supported