Satellite systems represent an extremely important segment in modern times. GNSS (global navigation satellite system) devices, i.e. their function, can be defined as the ability to provide independent geospatial positioning that covers the entire globe. In order for GNSS technology to function properly throughout the world, in the Earth's orbit, a total of thirty satellites are properly arranged, the main purpose of which is the establishment of communication and data exchange with devices placed on the Earth's surface. COSPAS – SARSAT is the designation of the international organization of the above-mentioned developed system. The Cospas - Sarsat organization consists of forty-three member states, i.e. forty-three national agencies. The Cospas - Sarsat system consists of GEOSAR and MEOSAR satellites. The entire system is a complex entity composed of four interconnected subsystems. The EPIRB device is directly connected to this system, which serves to broadcast the position of ships or other vessels via radio beacons, and which is specific for maritime transport.