The performance of low-cost RTK(real-time kinematic)GPS receivers hasbeen compared to a state-of-the-art system as well to each other. Both static and dynamic performanceshavebeen compared. The dynamic performance has been evaluated using a vehicle with driving robot on the AstaZero proving ground.The assembly of the low-cost RTK GPS receivers is presented, and the test set-ups described. Besides having a lower data output frequency, two of the low-cost receivers have static and dynamic performance not far fromthat of the state-of-the-art system.