Which statement about radio navigational warnings is TRUE?

Radio navigational warnings are broadcasted to ensure the safety of ships and other vessels at sea. Statement A is False - HYDROLANTS and HYDROPACS warnings are issued by the US National Geospatial-Intelligence Agency (NGA) and cover the Atlantic and Pacific Oceans respectively, while NAVAREA warnings are issued by coastal states and cover specific areas of the ocean. Statement B is False - NAVAREA warnings cover large areas of the ocean, not just coastal and inland navigation. Statement C is True - The US is responsible for NAVAREA warnings in the North Atlantic north of 7°N, and west of 15°W. Therefore, the correct answer is C.