82
GTN 625/635/650 Cockpit Reference Guide
190-01004-04 Rev. N
Messages
Message
Description
Action
VNAV -
Unavailable.
Excessive track
angle error.
The current track angle
error exceeds the limit,
causing the vertical
path guidance to go
invalid.
To correct this, navigate within 70°
of the active flight plan course.
VNAV -
Unavailable.
Parallel course
selected.
A parallel course has
been selected, causing
the vertical path
guidance to go invalid.
If vertical path guidance is desired,
disable parallel track.
VNAV -
Unavailable.
Barometric altitude
lost.
Data from the
barometric altitude
sensor has been lost,
causing the vertical
path guidance to go
invalid.
Contact dealer for service.
WAYPOINT -
Arriving at [wpt
name].
User has configured
the arrival alarm and
is within the specified
distance.
No action is necessary; message is
informational only.
Note 1:
There are several reference datums that waypoints can be surveyed against.
TSO-C146 normally requires that all waypoints be referenced to the WGS84
datum, but allows for navigation to waypoints that are not referenced to the
WGS84 datum so long as the pilot is notified. Certain waypoints in the navigation
database are not referenced to the WGS84 datum, or their reference datum is
unknown. If this is the case, this message is displayed. Garmin cannot determine
exactly how close the non-WGS84 referenced waypoint will be to the WGS84
datum that the GTN uses. Typically, the distance is within two nautical miles.
The majority of non-WGS84 waypoints are located outside of the United States.