- D: The distance between an aircraft and the home point, You need to get the aircraft current location and home location to calculate the horizontal disatance.
- H: The current aircraft altitude, you can call getAircraftLocation().getAltitude() to get.
- H.S和V.S：The hozizontal speed and vertical speed of an aircraft. The hozizontal speed is calculated by getVelocityX and getVelocityY. The vertical spped is getVelocityZ.