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A GMDSS Radio Maintainer's License allows a person to maintain, install, and repair GMDSS equipment at sea. A GMDSS Radio Operator's License is necessary for a person to use required GMDSS equipment. The holder of both certificates can be issued one GMDSS Radio Operator/Maintainer License. Finally, the GMDSS Restricted License is available for ...
DSC equipment, a part of the Global Maritime Distress Safety System (GMDSS), provides all the functionality of voice-only equipment and, additionally, allows several other features: The ability to call another vessel using a unique identifier known as a Maritime Mobile Service Identity (MMSI). This information is carried digitally and the ...
A Sailor VHF DSC unit. Digital selective calling (DSC) is a standard for transmitting predefined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems.
The Ship Radar Endorsement is required to repair, maintain or internally adjust ship radar equipment. It may, as an option, be added to the GROL. To qualify, one must: Hold or qualify for a GROL, GMDSS Radio Maintainer's License, First Class Radiotelegraph Operator's Certificate, or Second Class Radiotelegraph Operator's Certificate.
The LRIT system consists of the already installed (generally) shipborne satellite communications equipment, communications service providers (CSPs), application service providers (ASPs), LRIT data centres, the LRIT data distribution plan and the International LRIT data exchange.
A standard SART 9 GHz radar transponder, produced by Jotron, on board a Norwegian ferry. The unit is 251 mm high. A search and rescue transponder (SART) is a self-contained, waterproof transponder intended for emergency use at sea.
An AIS-SART made by German company WeatherDock AG. An AIS-SART is a self-contained radio device used to locate a survival craft or distressed vessel by sending updated position reports using a standard Automatic Identification System (AIS) class-A position report.
Certain models of Inmarsat-C terminals are approved for the Global Maritime Distress and Safety System (GMDSS) system, equipped with GPS. Fleet: a family of networks that includes the Inmarsat-Fleet77, Inmarsat-Fleet55 and Inmarsat-Fleet33 members (The numbers 77, 55 and 33 come from the diameter of the antenna in centimetres).