Can I derive the wind speed and direction? If I know the IAS and GS (with directional components) of an aircraft, can I derive the wind speed and direction?
I'm working on an application that simulates the flight of an aircraft.  Another application that takes as input, the computed trajectory of my aircraft, which includes the IAS and GS of the aircraft (at points along the trajectory) needs to know the wind speed and direction at those points.
I think it is possible, but am not sure, to isolate the wind speed and direction using the IAS/GS (or both).
Can someone confirm this?  Is this a reliable way to do this?  Do I need other information to complete the calculation?
No, you need the True AirSpeed (TAS).
The Indicated AirSpeed is not a realiable measure of it, since it is not even calibrated against the instrument mounting position and is not intended to measure the speed relative to the airmass (what you actually need to derive the wind components).