17-25
190-01007-03 Rev. Q
GTN 725/750 Pilot’s Guide
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Charts
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
Message
Description
Action
VCALC -
Arriving at VCALC
target altitude.
User has configured
a vertical descent
calculation, and the
aircraft is approaching
the target altitude.
No action is necessary; message is
informational only.
VISUAL
APPROACH NOT
ACTIVE -
Approach guidance
not available when
requesting
Direct-To runway.
Visual approach could
not transition to
active. Guidance is not
available.
Reactivate the approach or cancel
the Direct-To course.
VLOC RECEIVER -
Navigation receiver
has failed.
The nav radio is not
communicating properly
with the system.
Use GPS based navigation. Contact
dealer for service.
VLOC RECEIVER -
Navigation receiver
needs service.
The nav radio is
reporting to the GTN
that it needs service.
The nav radio may
continue to function.
Use GPS based navigation. Contact
dealer for service.
VNAV -
Unable to reach
vertical waypoint.
Current altitude
constraint cannot be
reached based on
current ground and
vertical speeds.
Attempt to intercept vertical path
by adjusting aircraft altitude.
VNAV -
Unavailable.
Upcoming flight
plan leg not
supported.
The lateral flight plan
contains a procedure
turn, vector, or other
unsupported leg type
prior to the active
vertical waypoint.
Treat the flight plan segments
before and after the affected leg as
separate vertical profiles. The GTN
cannot provide automatic guidance
between the two segments.
VNAV -
Unavailable.
Excessive
crosstrack error.
Current crosstrack
exceeds limit, causing
vertical path guidance
to become invalid.
Navigate within 10 nm of flight
plan centerline, or edit flight plan
to allow for vertical navigation.
