Maximum Usable Frequency. The highest frequency which is reflected by the ionosphere over any particular path.
A Navigation Area in the world
Navigational warning broadcast issued by an area coordinator of the world
Narrow Band Direct Printing. Formerly known as ‘telex over radio’.
Network Coordination Station in the Inmarsat system.
Navigation, Communication and Search and Rescue. An IMO sub-committee.
Communications between the distressed ship or survival craft and assisting units.