Set of instruments for general aviation airplanes, free flight, ultra-light, gliders, hot air balloons on your iPhone and Apple Watch. Includes a real barometric altimeter and variometer for iPhone 6 and later and iPad Air 2 and later. GPS modes allows to use the application even on devices without barometric pressure captors (below iPhone 6 of iPad Air 2). The currently available instruments are : - Ground Speed Indicator - Barometric and GPS altimeter - Barometric and GPS variometer - Barometric and GPS glider style variometer, including vario sound - True Course Indicator - Chronometer Made by real pilots for real pilots, the application is fully configurable, choosing witch units and scales you wish on each instrument. We are working hard on new features, please visit our web site and forum to give us input about your preferences.