16-25
190-01004-03 Rev. N
GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
Message
Description
Action
VNAV -
Unavailable.
Barometric altitude
lost.
A loss of data from
the barometric altitude
sensor causes vertical
path guidance to
become 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.
Table 16-1 Messages
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.