Most of the conversation here is focused on cheap drones. Are there cheap Inertial Navigation Systems (INS)? As I understand, it only appears inside of multi-million dollar cruise/ballistic missiles, fighter jets, and long-range bombers. Please correct me if I am wrong. Also, it might be that there are cheap INS systems that are good enough (e.g., "close only counts in horseshoes and hand grenades"), plus a bit of AI-enabled vision on the drone camera.