Radio Navigation System is a system used to navigate aircrafts and ships. It is composed of several components, including the LORAN (Long Range Navigation) system, which uses radio signals to determine the position of an aircraft or ship. The LORAN system is based on the transmission of low frequency radio signals from multiple transmitters, which are then received by the aircraft or ship. The signals are then used to calculate the position of the aircraft or ship. This system is used for navigation in areas where GPS is not available or unreliable.