Garmin GNC 300 Pilot's Manual page 32

REFERENCE
NAV KEY
SECTION
1
Date & Time,
Winds Aloft &
Trip Timer
VNAV Functions
NAV Menu 1
Winds Aloft Page
Vertical Navigation Page
22
The GNC 300' s winds aloft function is used to calculate the true direction and
speed of the winds aloft, 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 certain altitude near an airport or climb to an altitude before reaching a 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 GPS altitude will be displayed
E
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. If you are on a route or a direct-to,
the 'active to' identifier will be displayed automatically. Press
until NAV Menu 1 is displayed.
O
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
.
.