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NAV KEY
SECTION
1
Winds Aloft &
VNAV Functions
Winds aloft page
Vertical navigation page
26
The GNC 300XL' s winds aloft function is used to calculate the true direction and
speed of any winds, and indicates whether you are flying with a head wind or tail
wind, and the wind speed.
To calculate winds aloft:
N
O
1. Press
and rotate
C
2. Press
twice and rotate
K
O
3. Use
and
to enter your present heading in the 'hdg:' field. If your installation
includes a fuel/air data computer, this will be displayed automatically. Press
K
O
4. Use
and
to enter your true airspeed (TAS) in the 'tas:' field. If you have previously
calculated it using the density altitude/true air speed function, it will be displayed as the
default. Press E. The wind direction and speed and head/tail wind will be displayed.
The VNAV function calculates vertical speed requirements to reach a desired altitude before
or after a specified distance from a waypoint. This is helpful when you'd like to descend to a cer-
tain altitude near an airport or climb to an altitude before reaching a route or direct-to waypoint.
To calculate vertical navigation parameters:
N
O
1. Press
and rotate
C
2. Press
twice and rotate
K
O
3. Use
and
to enter the initial (from) altitude. Your current GPS altitude will be dis-
played as the default. Press
K
O
4. Use
and
to enter the desired final (to) altitude. Press
K
O
5. Use
and
to enter the distance from the waypoint. Press
K
6. Use
to select 'before' or 'after' the waypoint. Press
K
O
7. Use
and
to select the waypoint identifier (it must be a waypoint in the active
route or a direct-to waypoint). Press
until NAV Menu 1 is displayed.
O
E
until 'Winds?' is highlighted. Press
until NAV Menu 1 is displayed.
O
until 'Vnav Plan?' is highlighted. Press
E
.
E
.
E
E
.
E
.
.
E
.
E
.
.
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