A robust autopilot control system for a ground vehicle was designed, fabricated, and implemented on a remote control car. The autopilot system consists of navigation, guidance, and three controller subsystems. The autopilot’s hardware subsystems are an Arduino processor, GPS receiver, 9 DOF inertial measurement system, and an SD card data logger. A complete system simulation was developed and used to verify the integrated design and algorithms, prior to field testing. The simulation results indicated the system performs as designed, with no anomalous behaviors observed. Simulations were also used to assess and verify each of the three controllers’ robustness qualities. The complete hardware system was field tested and verified fully functional against complex mission scenarios. The system performed as designed, with no anomalous behaviors observed. The system performed successfully in the presence of external disturbances (e.g., rocks, holes, dirt piles in the vehicle’s path), which demonstrated and verified the design is robust. Additional robustness testing consisted of doubling the vehicle’s polar moment of inertia and verifying this did not have any adverse effects on system performance. All the planned tasks were completed and the project’s objectives were met.