An airplanes pitch, roll, and yaw will not give you it's heading. Pitch, roll, and yaw as QSO1 perfectly described are nothing more than an airplanes orientation on an x,y,z axis. The airplanes 'heading' is nothing more than the direction it is traveling towards.<br /><br />As much as the pilot might try to avoid... the airplane could be upsidedown (180 degree roll), backwards (180 degree pitch) and with a yaw of 180 degrees (also backwards)... but be at a heading of zero (traveling in the complete opposite direction the plane is facing). <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>