14-4
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Utilities
14.1
Vertical Calculator (VCALC)
NOTE
: If VNAV is enabled, the VCALC page is replaced with the VNAV
Profile page. For more information, refer to section 4.3.3.
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:
• Ground speed is less than 35 knots
• No active flight plan or direct-to destination
• SUSP mode
• Vectors-to-Final mode
• VLOC mode
• After the FAF on an approach
• OBS mode
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.
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