The textbook, in accordance with the program, focuses on the use of radio equipment in solving problems of maritime navigation. The classification of radio navigation systems is considered, errors in the measurement of navigation parameters are given, information about international organizations and documents regulating the use of marine radio navigation means are indicated. The study of radio navigation devices and systems is preceded by a course of basic radio engineering, which lays the foundation for understanding the principles of operation of systems. The understanding of these principles by the boatmaster is the basis for maximizing the potential of radio navigation systems, as well as complex electronic navigation and hydroacoustic complexes. For cadets of higher engineering maritime schools .