chapter  1
21 Pages

Radio wave propagation and the frequency spectrum

This chapter outlines the basic principles of signal propagation and the radio frequency spectrum used by the navigation systems likely to be encountered on board merchant ships. The use of radio waves for terrestrial global communications and navigation causes major problems, particularly in the areas of frequency allocation and interference. Consequently, for safe and efficient working practices to be maintained on the restricted radio frequency spectrum, it is essential that this limited resource is carefully policed.