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.
