Garmin aera 795/796 Pilot’s Guide190-01194-00 Rev. CAppendix G205Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices Index• Indicated Altitude—required entry for density altitude/true airspeed calculation.Enter the aircraft’s altimeter reading.• Baro Pressure—when the unit is receiving XM weather information, the fieldautomatically updates to the barometric pressure of the nearest METAR. If XMweather information is not available you need to enter the current barometricpressure.• Calibrated Airspeed— required entry for density altitude/true airspeedcalculation. Enter the aircraft’s airspeed indicator value.• Total Air Temp— required entry for density altitude/true airspeed calculation.Total Air Temperature (TAT) is the temperature of the air including the heatingeffect caused by speed. The temperature reading on a standard outside airtemperature gauge found on most piston aircraft is TAT.• Heading— required entry for winds aloft calculation. Use heading from theaircraft’s heading indicator or directional gyro.• True Airspeed— (calculated or user-entered figure) determined from entry ofcalibrated airspeed, barometric pressure, and total air temperature. This can alsobe entered directly for winds aloft calculations.• Tail Wind— (calculated figure) determined from entry of heading and trueairspeed.• Wind From—(calculated figure) determined from entry of heading and trueairspeed.• Wind Speed—(calculated figure) determined from entry of heading and trueairspeed.• Density Altitude— (calculated figure) determined from entry of indicatedaltitude, barometric pressure and total air temperature.
