TruAirspeed vs Wind Triangle

TruAirspeed is a True Airspeed Calculator for the iPhone and iPad. It's a bit different from other true airspeed calculators, in which the pressure altitude is an input. This requires resetting the altimeter to the standard sea level pressure of 29.92"Hg to read the pressure altitude. With TruAirspeed, you input the indicated altitude and the Kollsman window's pressure setting — the app then calculates the pressure altitude, density altitude, true airspeed and mach number for you. The calculations involved take full account of compressibility effects, but not shock waves, so it's limited to subsonic, non-transonic flight only. You have a choice of units for inputs and results, and you may choose either a calculator-style keypad (top row: 7-8-9) or a telephone-style keypad (top row: 1-2-3). You may also set a correction factor for your bird's airspeed indicator/pitot-static system, if you know it (mine is 0.95).

Calculate heading and ground speed for flight planning, wind speed and direction for in-flight wind assessment, or any other parameter in the aviation wind triangle! Whether you need an easy wind solver for flight planning or you're a student pilot learning the ins and outs of the E6B wind side, this app makes solving the wind triangle intuitive and easy. With the in-flight wind assessment (GPS-enabled devices only), the app uses GPS and heading to automatically calculate the current wind at your altitude by just inputting your TAS or CAS with conditions. This brings integrated flight deck capabilities to your aircraft with a readout of your current head/tail- and crosswind components. Inputs supported: heading, true airspeed, ground speed, track, wind direction, wind speed. Input any four parameters and the app calculates the rest. Calibrated airspeed (CAS) may be set instead of TAS. Inputting CAS prompts you to set barometric setting, indicated altitude, and outside air temperature (OAT). From this, TAS, pressure altitude, and density altitude are calculated. Try GPS mode (supported devices only) on the ground by enabling the GPS Demo Mode option.