A frequency–modulated mode of emission using digital information for automatic reception, without the use of a modulating sub–carrier.

A frequency–modulated mode of emission using analogue telephony (i.e. voice).

Forward Error Correction. An error–tolerant broadcast mode for NBDP, where the sending station transmits to an unlimited number of receiving stations.

Provides global voice, fax and high–speed data communications at speeds up to 128 kb/s via Inmarsat. It is suitable for a wide range of vessels, from deep–sea ships to offshore support craft. Provides full support for GMDSS, including features such as emergency call prioritization, as stipulated by IMO Resolution A.888 (21).

Inmarsat broadband service simultaneously providing broadband data and voice (using internet protocol (IP)), whilst still supporting existing voice and ISDN data capability for legacy applications.

The international commercial service offered under Inmarsat–C’s EGC capability, which allows authorised information providers, such as commercial subscription services, shipping companies or governments to broadcast messages to selected groups of vessels, each of which has registered with the information provider, and been added to a FleetNET closed group / network.

Frequency Modulation. The frequency of a carrier wave is made to vary in sympathy with the frequency of the input signal. Used for VHF marine band transmissions