Generally speaking, measurements of position coordinates are performed in navigation - points on the trajectory and trajectory derivatives - the velocity veclor and the acceleration vector Because of the occurrence of systematic and random errors there is no complete agreement between results of measurements performed by means of vanous devices and navigational systems both in the mathematical model of the navigational process and in the particular measure-ment models The work presented undertakes to compare trajectories. speeds and accelerations determined by various measuring instruments (navigational appliances and systems) The results can be used in a reliability analysis of the measurements and the working of navigational appliances and systems Com-paring various Information sources makes it possible to detect and identify systematic errors, which can result in verifying the mathematical models of particular phenomena and processes.