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GPSMAP 496 Owner’s Manual 49
Aviation
Aviation Mode Pages > E6B Tab
E6B Tab
The E6B tab in the Main Menu calculates Density Altitude, True
Airspeed, and Winds Aloft (Head Wind, Tail Wind, Wind From, and
Wind Speed), based on information you enter.
To open the E6B tab of the Main Menu:
1. Press MENU twice to open the Main Menu.
2. Highlight E6B from the vertical list of tabs.
E6B Tab
Calculated
gures
Calculated
gure
Calculated or
user-entered
gure
Barometric
pressure
from the
nearest
METAR
Indicated Altitude—required entry for density altitude/true airspeed
calculation. Enter the aircraft’s altimeter reading.
Calibrated Airspeed
—required entry for density altitude/true
airspeed calculation. Enter the aircraft’s airspeed indicator.
Heading—required entry for winds aloft calculation. Use heading
from the aircraft’s heading indicator or directional gyro.
Baro Pressure
—when the unit is receiving XM weather
information, the eld automatically updates to the barometric
pressure of the nearest METAR. If XM weather information is not
available you need to enter the current barometric pressure.
Total Air Temperature
—required entry for density altitude/true
airspeed calculation. Total Air Temperature (TAT) is the temperature
of the air including the heating effect caused by speed. The
temperature reading on a standard outside air temperature gauge
found on most piston aircraft is TAT.
Head Wind—(calculated gure) determined from entry of heading
and true airspeed.
Wind From—(calculated gure) determined from entry of heading
and true airspeed.
Wind Speed—(calculated gure) determined from entry of heading
and true airspeed.
True Airspeed—
(calculated or user-entered gure) determined
from entry of calibrated airspeed, barometric pressure, and total
air temperature. This can also be entered directly for winds aloft
calculations.
Density Altitude—
(calculated gure) determined from entry of
indicated altitude, barometric pressure and total air temperature.