This document discusses techniques for defeating drones, including GPS spoofing and jamming. It begins with an overview of drone construction and how drones use GPS for navigation. It then explains how GPS works and discusses attacking GPS through jamming and spoofing. Jamming involves broadcasting interfering signals to block GPS, while spoofing aims to transmit fake GPS signals and mislead drones. The document also introduces SkyJack, a tool for wirelessly hacking drones using packet injection and deauthentication attacks.