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Some Information on

Maritime Distress & Safety Telecommunication Data Elements

What these Data Elements Are

The following data elements are used in the transmission of maritime distress and safety information. Each data element listed is necessary to either contact a ship at sea, or identify the sender of a distress alert. The data elements specified are currently in use for maritime distress, safety and routine telecommunication purposes.

CALL SIGN

Definition: A unique identifier of a radio station

Used for: manual identification of Morse and radiotelephone ship and coast stations, 406 MHZ EPIRBs, other radio transmissions.

Data element data type: Character string

Data element maximum length: 7 characters

Data element domain: alphanumeric

MARITIME MOBILE SERVICE IDENTITY

Definition: "Maritime mobile service identities are formed of a series of nine digits which are transmitted over the radio path in order to uniquely identify ship stations, ship earth stations, coast stations, coast earth stations and group calls

Used for: DSC identifier, 406 MHZ EPIRB identifier, SITOR (narrow-band direct printing) identifier, basis for Inmarsat identifier.

Data element data type: character string

Data element maximum length: 10 digits

Data element domain: numeric

SELECTIVE CALL NUMBER

Definition: A unique numeric identifier of a ship or coast station in the maritime mobile service for simplex teletype over radio (SITOR).

Used for: SITOR identifier (intended to be replaced by MMSI)

Data element data type: character string

Data element maximum length: 5 (ship stations) or 4 (coast stations) digits

Data element domain: numeric only

MOBILE EARTH STATION IDENTIFICATION NUMBER (MESIN)

Definition: A unique numeric identifier of an INMARSAT-C, INMARSAT-M, INMARSAT-B and all new INMARSAT ship earth station.

Used for: Calls to INMARSAT (except INMARSAT-A) satellite terminals on ships. INMARSAT-C (as of summer 92, the only non-A operational system) is restricted to data or telex only.

Data element data type: character string

Data element maximum length: 9 digits

Data element domain: numeric only

SHIP EARTH STATION IDENTITY NUMBER

Definition: A unique numeric identifier of an INMARSAT-A ship earth station

Used for: Calls to INMARSAT-A satellite terminals on ships, for telephone and telex.

Data element data type: character string

Data element maximum length: 7 digits

Data element domain: numeric only

SHIP STATION IDENTITY

Definition: A unique numeric identifier of an INMARSAT-E EPIRB.

Used for: Identification of INMARSAT-E EPIRBs

Data element data type: Character string

Data element maximum length: 9 digits

Data element domain: Numeric only

406 MHZ EPIRB UNIQUE IDENTIFIER NUMBER

Definition: A unique alphanumeric identifier of a 406 MHZ satellite EPIRB.

Used for: Identification of 406 MHZ EPIRBs

Data element data type: character string

Data element maximum length: 15 characters

Data element domain: hex number

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Contact Information

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Last modified: March 15, 1999