differential global positioning system is an enhancement to the global positioning system (GPS) which provides improved location accuracy, in the range of operations of each system, from the 15-metre nominal GPS accuracy to about 1–3 centimetres in case of the best implementations, diferentsiaalne globaalne positsioneerimissüsteem on globaalse positsioneerimissüsteemi (GPS) täiustus, mis tagab parema asukohatäpsuse iga süsteemi tööulatuses alates 15-meetrisest GPS-nimitäpsusest kuni umbes (1 kuni 3) sentimeetrini parimate rakenduste korral