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Garmin G1000 Cockpit Reference Guide for the Columbia 350/400
190-00567-01 Rev. A
1-12
SECTION 1
SYSTEM OVERVIEW
1.6 VERTICAL NAVIGATION
In WAAS capable installations, one of two altitude
sources is used by the G1000 when giving vertical
navigation guidance. WAAS GPS altitude is used when
giving guidance for a WAAS approach. Baro corrected
altitude is used when vertical guidance is given in all other
situations and in non-WAAS systems.
The G1000 system can use altitude constraints
associated with lateral waypoints to give guidance for
vertical navigation. These altitudes are, depending on the
specific instance, entered by the pilot or retrieved from the
published altitudes in the navigation database.
The navigation database only contains altitudes
for procedures that call for “Cross at” altitudes. If the
procedure states “Expect to cross at,” then the altitude will
not be in the database. In this case the altitude may be
entered manually.
NOTE:
All arrival procedure altitudes contained in
the navigation database are for turbojet aircraft only.
Alter or enter altitudes as desired to comply with the
ATC clearance.
When activating or loading an arrival or approach
procedure into an active flight plan, the VNV ‘ALT’ fields
will be populated with any altitudes that can be retrieved
from the navigation database.
Since altitudes loaded with an arrival procedure are
published only for turbojet aircraft, the altitudes are
displayed as white text indicating that the altitudes are
displayed for reference only. An arrival waypoint altitude
may be used (or “designated”) as is, or changed to a
different altitude. An altitude is designated by pressing the
FMS
Knob and turning the large
FMS
Knob to place the
cursor on the desired altitude and pressing the
ENT
Key or
entering a different value and pressing the
ENT
Key. The
altitude will now be displayed as light blue text, indicating
that the altitude is now designated to give vertical speed
and deviation guidance.
Approach waypoint altitude constraints are automatically
designated for use when the approach is loaded. These
altitudes will be displayed as light blue text indicating the
altitudes will be used in vertical guidance calculations.
Waypoint altitude constraints may be designated up to, but
not including the FAF. The FAF will always be a “reference
only” altitude and cannot be designated, unless the selected
approach does not provide vertical guidance. In this case,
the FAF altitude can be designated.
Altitudes that have been designated for use in vertical
guidance may also be made “non-designated” by placing the
cursor over the desired altitude and pressing the
CLR
Key.
Other displayed altitudes may change due to re-calculations
or rendered invalid as a result of manually changing an
altitude to a non-designated altitude.
To help interpret the meanings of how the altitudes are
presented, keep the following points in mind:
• When the altitude is displayed in light blue,
the system is using that altitude (designated) to
determine vertical speed and deviation guidance.
• When the altitude is displayed in white, it is not being
used by the system (non-designated) to determine
the vertical speed and deviation guidance.
• An altitude displayed as small text is an altitude that
is published in the navigation database.
• Altitudes displayed as a light blue subdued text
cannot be used in the current vertical navigation
calculations.
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