GMDSS - GLOSSARY OF TERMS


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S

SafetyNET

Inmarsat satellite system for transmission of navigational and meteorological warnings to ships, complementary to the International NAVTEX service on 518 kHz. The ability to receive SafetyNET service information will generally be necessary for all ships which sail beyond the coverage of NAVTEX.

SAR

Search and Rescue.

SAR coordinating communications

Communications necessary for the coordination of ships and aircraft participating in a search and rescue operation.

SART

Search and Rescue Radar Transponder. Also known as a survival craft radar transponder or radar transponder.

Selcall

An identification number, 5 digits for ship stations and 4 digits for coast stations, programmed into NBDP (telex) equipment. In the ALRS Volume 1, the coast station Selcall is shown in square brackets, Guam [1096]. It is only required generally for ARQ mode of operation.

SHF

Super High Frequency (3 to 30 GHz).

Ship Earth Station (SES)

An earth station in the maritime mobile

Ship station

A station in the terrestrial radio

Simplex

Operating method in which transmission is made possible alternatively in each direction of a telecommunication channel, for example, by means of manual control (see single

Single frequency

The same frequency used for transmission and reception (simplex).


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