Garmin GNC 300 Pilot's Manual page 30

REFERENCE
SECTION NAV KEY
1
VNAV & Checklists
Density Altitude &
True Airspeed
Nav Menu 1
Density Altitude/True Airspeed Page
Fuel Planning Page
20
The density altitude/true airspeed function is also accessed from NAV Menu 1.
Density altitude is the altitude at which your aircraft will perform depending on several
environmental conditions, including air pressure and total air temperature (the tempera-
ture including the effect of speed, read on a standard outside temperature gauge on most
aircraft). True airspeed considers the same factors.
To calculate the density altitude and true air speed:
N O
1. Press and rotate
C
2. Press twice and rotate
E
3. Press to access the density altitude page.
K O
4. Use and to enter the indicated altitude and press
K O
5. Use and to enter the calibrated air speed (cas). Press
K O
6. Use and to enter the air pressure ('pres') and press
K O
7. Use and to enter the total air temperature.
E
8. Press and the density altitude and true air speed will be calculated and displayed.
C
9. Press to remove the cursor.
If your installation includes components to provide any of the information
required on the density altitude page, they will be used as the defaults.
f
The uel planning page will display fuel requirements for both direct-to naviga-
tion and programmed routes. The fuel planning function requires the pilot to know
the initial amount of fuel on board and the flow rate. You may also enter different
ground speeds to view various information based on different travel times. If your
installation is interfaced to a fuel flow sensor, the flow rate and other information will
be used from the fuel flow sensor.
until NAV Menu 1 is displayed.
O
to highlight 'Dalt/tas?'.
E
.
E
.
E
.