4-10 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. BPlanning4.4.2 Computing DALT/TAS/Wind StatisticsDensity altitude and true airspeed calculations are dependent on indicated altitude, barometric pressure,and total air temperature.Wind data calculations are dependent on true airspeed, aircraft heading, and ground speed.Wind direction is dependent on the NAV Angle system unit setting.If wind speed is zero, wind direction displays as dashes.DENSITY ALTITUDE WIND DATA• Pressure altitude corrected fornonstandard temperature• Units display in increments of ten• Wind direction and speed• Headwind• Tailwind• True air speedCompute and display density altitude and current windconditions. Calculations are based on current input values.Statistics display on a dedicateddata page. This information isfor planning purposes only.Dashes indicate when inputvalues are invalid.
