The principle consists of the transmission of signals from a central ground station that reaches the disponder on the ship via at least two satellites that are fixed in position and which then return to the ground station by the same path.
Umthetho unemiqondiso yosasazo esuka kwisitishi somhlaba asisembindini esifikelela kunomathotholo osenqahaweni odlula iinkwenkwezi ezijikeleza ezinye ezimbini ezixinzelelweyo kwindawo yazo ezithi zibuyele kwisitishi esisemhlabeni ngendlela enye.