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190-01004-04 Rev. N
GTN 625/635/650 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 KTOP at 4 NM from the airport. Since the vertical speed is set to
400 feet per minute, the descent needs to begin now. At the present location, a
vertical speed rate of -404 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 select altitude
type, MSL or Above WPT.
Touch to select Before
or After waypoint.
Touch to enter
vertical speed.
Touch to select
waypoint.
Status of Profile
Vertical Speed Required
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.
Touch to reset
the target
altitude, altitude
type, VS profile,
and offset fields.
Touch to show
messages related to
the VCALC profile on
the message page.
VCALC Profile Menu