Spoofing attacks, the intention to deceive a device by broadcasting false GPS signals, on UAVs can be devastating. Spectracom have developed a GPS vulnerability test system, allowing developers to understand how a GPS-based navigation system will react in various spoofing scenarios, evaluate the risk and efficiently implement countermeasures. Based on the innovative GSG-Series GPS/GNSS signal generation platform, this system helps engineers to harden GPS/GNSS receiver applications against the threat of spoofing.