Vertical Calculator (Vcalc) - Garmin GTN 625 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 profile for an aircraft to be at 2500 feet MSL 4 NM
before KRNO. Since the vertical speed is set to 400 feet per minute, the descent
needs to begin in 4 minutes and 51 seconds. At the present location, a vertical
speed rate of -21 feet per minute is required to reach the target. There are no
menu options for the VCALC Profile page.
Touch to set
target altitude.
Touch to
enter distance
offset from
target
waypoint
NOTE: The Altitude Type key will not be available when the VCALC target
waypoint does not have valid altitude data.
Touch to reset
the target
altitude, altitude
type, VS profile,
and offset fields.
190-01004-04 Rev. E
VCALC Key
Touch to
select Before
or After
waypoint.
Status of Profile
VCALC Page
VCALC Profile Menu Options
GTN 625/635/650 Cockpit Reference Guide (CRG)
Touch to select
altitude type,
MSL or Above
WPT.
Vertical Speed Required
Touch to enter
vertical speed
Touch to select
waypoint.
Touch to show
messages related to
the VCALC profile on
the message page.
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