49
190-01007-04 Rev. K
GTN 725/750 Cockpit Reference Guide
Utilities
Vertical Calculator (VCALC)
The VCALC page uses GPS position, GPS computed altitude, and
pilot-selected parameters to calculate and display the time to begin descent and
vertical speed required to reach a desired altitude above a designated waypoint
offset. The screenshot below is a sample profile for an aircraft to be at
1,000 feet above KMCI 10 NM from the airport. Since the vertical speed is set
to 400 feet per minute, the decent needs to begin in 7 minutes and 15 seconds.
At the present location, a vertical speed of -244 feet per minute is required to
reach the target. There are no menu options for the VCALC Profile page.
G
G
Touch to set
target altitude.
Touch to set
target altitude.
Touch to select
Before or After
waypoint.
Touch to
enter vertical
speed.
Touch to
select
waypoint.
Status of
Profile
Vertical Speed
Required
Touch to
display VCALC
messages in
message list.
Touch to enter
distance offset
from target
waypoint.
VCALC Page
NOTE:
The Altitude Type key will not be available when the VCALC target
waypoint does not have valid altitude data.
