One set of landing gear is provided. 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 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. DJI Phantom 3 Part 29 Landing Gear PRO/ADV