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Marine radio was the first commercial application of radio technology, allowing ships to keep in touch with shore and other ships, and send out a distress call for rescue in case of emergency. Guglielmo Marconi invented radio communication in the 1890s, and the Marconi Company installed wireless telegraphy stations on ships beginning around 1900.
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 emergency locator beacon is a radio beacon, a portable battery powered radio transmitter, used to locate airplanes, vessels, and persons in distress and in need of immediate rescue. Various types of emergency locator beacons are carried by aircraft, ships, vehicles, hikers and cross-country skiers.
The best emergency weather radios are compact, portable, durable, and have backup power sources—via hand crank, batteries, or solar panels—so you’re never caught with a dead radio.
Essentially these are hand-held VHF radios that are used in any survival craft, such as a life boat or life raft. SCTs with re-chargeable type batteries may be used for on-board communications as well. [1] The International Maritime Organization (IMO) requires the following from SCTs: Must be able to be operated by unskilled personnel
DSC was intended to eliminate the need for persons on a ship's bridge or on shore to continuously guard radio receivers on voice radio channels, including VHF channel 16 (156.8 MHz) and 2182 kHz now used for distress, safety and calling. A listening watch aboard GMDSS-equipped ships on 2182 kHz ended on February 1, 1999.