Garmin GDU™ 37X Pilot’s Guide190-01054-00 Rev. EAppendix E213Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices IndexE6B CALCULATORThe E6B Calculator in the Main Menu calculates Density Altitude, True Airspeed, andWinds (Head Wind, Wind From, and Wind Speed), based on the information entered.Accessing the E6B calculator:1) Press the MENU Key twice to open the Main Menu.2) Turn or move the FMS Joystick to highlight ‘E6B Calculator’, and press theENT Key. The E6B Calculator Page is displayed.E6B Calculator PageCalculatedFiguresBarometricPressurefrom theNearestMETARCalculatedor User-enteredFigure• 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 field auto-matically updates to the barometric pressure of the nearest METAR. If XM weatherinformation is not available you need to enter the current barometric pressure.• Calibrated Airspeed— required entry for density altitude/true airspeed calculation.Enter the aircraft’s airspeed indicator value.• Total Air Temp— required entry for density altitude/true airspeed calculation. TotalAir Temperature (TAT) is the temperature of the air including the heating effect causedby speed. The temperature reading on a standard outside air temperature gauge foundon most piston aircraft is TAT.
