Free flight variometer

This app helps you to find thermals that trigger near your position during an XC flight. The app shows you where them are with voice messages like: "Thermal to the right/left" or "Thermal ahead/behind". It also gives you the wind speed and direction as well as the optimal speed to fly through voice messages like: "Brake one", "Trim speed", "Speed up one" and "Speed up two" that correspond to each of these flight configurations: minimum sink rate, best glide rate, half accelerated and full accelerated. You must enter your wing's sink rate and speed in calm air, for this four configurations, in the app settings screen. For thermal finder function to work properly you must fly at the app recommended speed.

The philosophy behind this app is to replace the visual interaction with your device by audio interaction composed of sounds and voice messages. That's why you won't need to leave the screen of your phone on or keep it in sight during the flight, but inside a pocket of your flight harness, which brings freedom (no cockpit nor spare batteries) to your flights. For the thermal finder function to work properly it's important that the phone be attached to your harness rather than to your clothes.

There are wired and wireless headset helmet kits that will allow you to interact with the app, answer phone calls and even connect a handheld transceiver during the flight.

The app uses the built-in barometer and compass sensor of your phone. Therefore it's recommended to keep your phone away from electromagnetic fields during the flight. In the event that your phone didn't have a built-in barometer the app supports the Bluefly external barometer module.

To avoid your phone entering in sleep mode while running the app with the screen off, set autostart mode on and disable battery optimizations for the app.