The Corporate Group has developed one of the two existing state radiolocation identification systems. Radiolocation in cellular telephony uses base stations. In Australia, this spectrum is allocated to radiolocation and scientific-medical services. Many radiolocation systems, including GPS, use ToA. The main users are naval one-way transmissions and radiolocation systems. Among the main applications of radiophysics are radio communications, radiolocation, radio astronomy and radiology. Like radiolocation, it is a type of radiodetermination. Radiolocation is also used in cellular telephony via base stations. Radiolocation is employed in a wide variety of industrial and military activities. A stud finder uses radiolocation when it uses radio waves rather than ultrasound. Radiolocation is also used in real-time locating systems (RTLS) for tracking valuable assets.