Garmin GTN 750 Pilot's Manual Upgrade Supplement page 83

Message
VCALC -
Arriving at VCALC
target altitude.
VISUAL
APPROACH NOT
ACTIVE -
Approach guidance
not available when
requesting
Direct-To runway.
VLOC RECEIVER -
Navigation receiver
has failed.
VLOC RECEIVER -
Navigation receiver
needs service.
VNAV -
Unable to reach
vertical waypoint.
VNAV -
Unavailable.
Upcoming flight
plan leg not
supported.
VNAV -
Unavailable.
Excessive
crosstrack error.
190-01007-03 Rev. Q
Description
User has configured
a vertical descent
calculation, and the
aircraft is approaching
the target altitude.
Visual approach could
not transition to
active. Guidance is not
available.
The nav radio is not
communicating properly
with the system.
The nav radio is
reporting to the GTN
that it needs service.
The nav radio may
continue to function.
Current altitude
constraint cannot be
reached based on
current ground and
vertical speeds.
The lateral flight plan
contains a procedure
turn, vector, or other
unsupported leg type
prior to the active
vertical waypoint.
Current crosstrack
exceeds limit, causing
vertical path guidance
to become invalid.
GTN 725/750 Pilot's Guide
Action
No action is necessary; message is
informational only.
Reactivate the approach or cancel
the Direct-To course.
Use GPS based navigation. Contact
dealer for service.
Use GPS based navigation. Contact
dealer for service.
Attempt to intercept vertical path
by adjusting aircraft altitude.
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.
Navigate within 10 nm of flight
plan centerline, or edit flight plan
to allow for vertical navigation.
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
17-25
Index