The task of the system is the aerial reconnaissance of an area for primary survey. The container of the system includes two nuclear detectors, GPS-receiver, barometric altitude-meter and data logger which can send the recorded data to the on-board notebook or to the PC of the operation center. One of the two detectors is a BNS-98 dose rate meter while the other one is a specially designed, highly sensitive NDI-65/SK type intelligent scintillation detector, built in a lead collimator which ensures the capability of finding and localizing discrete radiation sources on the ground. The system calculates the radiation level of the contaminated area (referred to 1 m altitude) or the dose rate of a discrete radiation source from the dose rate measured at the flying altitude considering the atmospheric and ground conditions .