50
GPSMAP 495 Owner’s Manual
Aviation
Aviation Mode Pages >
E6B Tab
To calculate true airspeed and density altitude:
1. From the
E6B
tab, highlight the
Indicated Altitude
field (at the
top of the page), and press
ENTER
.
2. Use the
ROCKER
to enter the altitude shown on your altimeter.
Press
ENTER
when finished.
3. Repeat steps 1 and 2 to enter the
Calibrated Airspeed
,
Baro Pressure,
and
Total Air Temperature
. (For
Calibrated
Airspeed
, use the speed shown on your airspeed indicator.
Use the current altimeter setting for
Baro Pressure
.
Total Air
Temperature
is the temperature of the outside air including
the heating effect caused by speed. For most aircraft, this is
the temperature reading on a standard outside air temperature
gauge.) The calculated figures for
True Airspeed
and
Density
Altitude
are shown in the designated fields.
E6B Tab
Calculated
figures
Calculated
figure
Calculated or
user-entered
figure
Barometric
pressure
To calculate winds aloft:
1. Follow the steps in the previous procedure to determine true
airspeed.
OR
Use the
ROCKER
and
ENTER
keys to manually enter a true
airspeed figure in the
True Airspeed
field.
2. Use the
ROCKER
to highlight the Heading field, and press
ENTER
.
3. Use the
ROCKER
to enter the aircraft heading shown on your
directional gyro or compass. Press
ENTER
when finished.
The calculated figures for Head Wind, Wind From, and Wind
Speed appears.
NOTE:
If a True North reference is currently selected as the
heading reference on your GPSMAP 495, you must enter the
Heading using a True North reference to determine winds
accurately.
To restore defaults on the E6B tab:
1. Open the
E6B
tab on the Main Menu.
2. Press
MENU
to open the options menu.
3. Highlight
Restore Default
, and press
ENTER
.
