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.