The DJI Phantom 3 Landing Gear includes one set. The landing gear is designed to protect your Phantom's camera and shell during landing. It also provides a stable platform when the aircraft is not in use.
A compass is included with the landing gear. If the old compass needs to be replaced, you would need to open up your Phantom 3 Professional/Advanced during the installation process. If the old compass does not need to be replaced, please place the old compass inside the new landing gear during the installation process.