Garmin GDU 37X Pilot's Manual page 232

Appendix E
• Heading— required entry for winds aloft calculation. Use heading from the aircraft's
heading indicator or directional gyro.
• Head Wind— (calculated figure) determined from entry of heading and true air-
speed.
• Wind From—(calculated figure) determined from entry of heading and true airspeed.
• Wind Speed—(calculated figure) determined from entry of heading and true air-
speed.
• Density Altitude— (calculated figure) determined from entry of indicated altitude,
barometric pressure, and total air temperature.
• True Airspeed— (calculated or user-entered figure) determined from entry of
calibrated airspeed, barometric pressure, and total air temperature. This can also be
entered directly for winds aloft calculations.
Calculating true airspeed and density altitude:
1) From the E6B Calculator Page, enter the altitude shown on the altimeter
into the 'Indicated Altitude' field, and press the ENT Key.
2) Repeat for 'Calibrated Airspeed', 'Baro Pressure', and 'Total Air
Temperature' fields. (For Calibrated Airspeed, use the speed shown on
the 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.
Calculating winds aloft:
1) Calculate or enter the true airspeed into the 'True Airspeed' field, and press
the ENT Key.
2) Enter the aircraft heading shown on the directional gyro or compass into
the 'Heading' field, and press the ENT Key. Head Wind, Wind From, and
Wind Speed are calculated.
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Garmin GDU 37X Pilot's Guide
™
190-01054-00 Rev. E