GMDSS - GLOSSARY OF TERMS


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M

MUF

Maximum Usable Frequency. The highest frequency which is reflected by the ionosphere over any particular path.

N

n mile

nautical mile (1 nautical mile = 1 852 m)

NAVAREA

A Navigation Area in the world

NAVAREA warning

Navigational warning broadcast issued by an area coordinator of the world

NAVTEX

Short range system for transmission of navigational and meteorological warnings to ships by NBDP. The International NAVTEX service is the system for broadcast and automatic reception of MSI by means of narrow

NBDP

Narrow Band Direct Printing. Formerly known as ‘telex over radio’.

NCS

Network Coordination Station in the Inmarsat system.

NCSR

Navigation, Communication and Search and Rescue. An IMO sub-committee.

O

On—scene communications

Communications between the distressed ship or survival craft and assisting units.

OTF

Optimum Traffic Frequency. The optimal frequency for sustained radio reliability, approximately 85% MUF.


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