En Route Vertical Navigation - Garmin GTN 625 Pilot's Manual

4.3.3

En Route Vertical Navigation

NOTE: This feature is available in software v6.50 and later.
The vertical navigation (VNAV) feature provides vertical profile guidance during
the descent phase of flight. Guidance is based on altitude constraints associated
with lateral waypoints in the active flight plan.
Functions:
• Presents vertical path guidance to the descending path as either a line
joining two waypoints with specified altitudes or a linear deviation from the
desired path (i.e., the vertical angle from the specified waypoint or altitude)
• Integrate vertical waypoints into the active flight plan
• Support both manual and autopilot coupling
4.3.3.1 VNAV Requirements
• Enablement by the installer
• A baro-corrected altitude source
If en route vertical navigation is not enabled, the GTN provides a single
waypoint vertical calculator. For more information, refer to section 14.1.
For installation details related to en route vertical navigation, consult the AFMS.
4.3.3.2 VNAV Limitations
The GTN allows you to create a vertical navigation path with multiple altitude
constraints in the flight plan. These altitudes are removed when the flight plan
is stored in the flight plan catalog.
Most flight plan waypoints may be assigned an altitude constraint for use in
vertical navigation.
Exceptions include:
• Flight plan legs containing headings
• Flight plan legs that terminate at an altitude (e.g., a climb to 1,800 ft before
making a turn and proceeding direct to fix)
190-01004-03 Rev. P GTN 625/635/650 Pilot's Guide
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