15-4
GTN 725/750 Pilot’s Guide
190-01007-03 Rev. Q
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
15.1
Vertical Calculator (VCALC)
NOTE
: If VNAV is enabled, this 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 would 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 Map Page
to keep you informed of your progress.
Cruise Altitude
Target Altitude
Target Offset (Before)
Target
Waypoint
Figure 15-3 VCALC Target
VCALC is inhibited in the following conditions:
• Groundspeed 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.
