AirCalc is a simple air data calculator that displays the relative wind speed and direction.
Note that the triple headed wind arrow points in the direction the wind is going.
It also shows components for crosswind and head/tail wind. This is computed from user entered airspeed and drift and from internally derived GPS track and groundspeed.
It also computes pressure and density altitude. Where available, the internal barometer is used for altitude. Just enter the QNH and temperature.
The Options page allows you to select your preferred units.
For those who use an EFB app on an iPad in flight, swipe up from the bottom to switch between your EFB app and AirCalc quickly.
The calibrated airspeed (CAS) is critical in calculating accurate wind data. Once set approximately, use the stepper to keep it up to date as your airspeed changes.
The drift angle is also critical in calculating accurate wind data. Check your compass and directional gyro and compare the heading to the track from the GPS. Use the stepper to set the difference, positive values for heading right of track. See the heading bug move as you do this.
Altitude and temperature affect the wind much less.
Devices that don't have a barometer need you to enter the altitude. Use the stepper to quickly change in 500' increments.
All bearings are magnetic. Check the options page to see the magnetic variation at your current location.
We produce mobile apps for the general aviation community.