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14-3190-01004-03 Rev. B
Garmin GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
14.1 Vertical Calculator (VCALC)
The Vertical Calculator (VCALC) function allows you to create a three-
dimensional profile which guides you from your present position and altitude to
a final (target) altitude at a specified location. This is helpful when you’d like to
descend to a certain altitude near an airport. Once the profile is defined, message
alerts and additional data can be configured on the Default NAV and Map Pages
to keep you informed of your progress.
Cruise Altitude
Target Altitude
Target Offset (Before)
Target
Waypoint
Figure 14-3 VCALC Target
VCALC is inhibited in the following conditions:
•Groundspeedislessthan35knots
•Noactiveightplanordirect-todestination
•SUSPmode
•Vectors-to-Finalmode
•VLOCmode
•AftertheFAFonanapproach
WARNING: Do not use VCALC messages as the only means of either avoiding
terrain/obstacles or following ATC guidance. VCALC provides advisory
information only and must be used in concert with all other available navigation
data sources.