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D

DRF

Disaster Recovery Facility. (ie. AMSA backup facility)

Duplex

Operating method in which transmission is possible simultaneously in both directions of a telecommunication channel.

E

ECDIS

Electronic Chart Display and Information System. A computer–based navigation information system that complies with IMO regulations.

EHF

Extra High Frequency. (30 to 300 GHz)

Enhanced Group Calling (EGC)

A system in the GMDSS to broadcast MSI (SafetyNET) and routine/ public correspondence (FleetNET) anywhere in the Inmarsat coverage area, via the Inmarsat satellite system.

EPIRB

Emergency Position Indicating Radio Beacon.

F

F1B

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

F3E

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

FEC

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

Fleet77

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).

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