There is an emerging number of self-driving cars and drones being developed, these devices use GPS signals for navigation. So there has been an increased concern in securing these devices from going into the wrong hands or being hijacked. A GPS spoofer is easily implemented using low cost material and already developed software. Most devices, like cellphones, don’t implement anti-spoofing measures, so it’s a significant issue. This paper presents anti-spoofing solutions for systems that use global navigation satellite systems.