9-4airspeed, use indicated airspeed instead.· Enter your altimeter setting.· Enter the total air temperature (TAT). TAT is the temperature of theair including the heating effect caused by speed (the temperature readon a standard outside air temperature gauge found on most pistonaircraft is TAT). The GPS 100 will display the resulting density altitudeand true airspeed.The TAS computed on this page will automatically become the default valueused in the wind aloft calculations described in the following section.9.4 WIND ALOFT (Aviation Feature)HeadingTrue AirspeedWind Direction(from) Wind SpeedHead/Tail WindWIND ALOFT PAGEThe Wind Aloft Page allows you to calculate the direction and speed of thewind. This calculation requires TAS and heading information. If you havecalculated TAS on the Density Altitude/TAS Page, it will be offered as thedefault.To calculate wind aloft...· Enter your present heading.· Enter the TAS (optional if you have computed TAS on the DensityAltitude/TAS Page). The GPS 100 will display the wind direction,speed, and the head/tail wind you are encountering.9.5 VERTICAL NAVIGATION (Aviation Feature)
