Vertical Calculator (Vcalc) - Garmin GTN 725 Cockpit Reference Manual

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 profi le for an aircraft to be at 2000
feet MSL 4 NM before KPBI. Since the vertical speed is set to 400 feet per
minute, the descent needs to begin in 2 minutes and 12 seconds. At the
present location, a vertical speed rate of -328 feet per minute is required to
reach the target. There are no menu options for the VCALC Profi le page.
target altitude.
Touch to set
target altitude.
Touch to enter
distance offset
from target
waypoint.
Touch to select
Before or After
waypoint.
Status of
Profi le
NOTE: The Altitude Type key will not be available when the VCALC target
waypoint does not have valid altitude data.
190-01007-04 Rev. C
VCALC Key
Touch to set
VCALC Page
GTN 725/750 Cockpit Reference Guide (CRG)
Touch
to enter
vertical
speed.
Touch
to select
waypoint.
Vertical
Speed
Required
Touch to
display
VCALC
messages in
message list.
43