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2. Electrofishing - Wikipedia

   en.wikipedia.org/wiki/Electrofishing

   Electrofishing by boat. There are three types of electrofishers: backpack models, tote barge models, and boat mounted models, sometimes called a stunboat. [2] Backpack electrofisher generators are either battery or gasoline powered. They employ a transformer to pulse the current before it is delivered into the water.

3. Marine VHF radio - Wikipedia

   en.wikipedia.org/wiki/Marine_VHF_radio

   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.

4. Maritime mobile amateur radio - Wikipedia

   en.wikipedia.org/wiki/Maritime_mobile_amateur_radio

   An amateur radio installation on a 28' yacht, including 100W HF transceiver with microphone, manual antenna tuner, and morse key. Maritime mobile amateur radio is an amateur radio transmission license that allows maritime operators to install and use radio while they operating at sea. The call sign of operators is extended by adding the suffix ...

5. Automatic identification system - Wikipedia

   en.wikipedia.org/wiki/Automatic_identification...

   Radio call sign: international radio call sign, up to 7 characters, assigned to the vessel by its country of registry; Name: 20 characters to represent the name of the vessel; Type of ship/cargo; Dimensions of ship, to nearest meter; Location of positioning system's (e.g., GPS) antenna on board the vessel: in meters aft of bow and meters port ...

6. Digital selective calling - Wikipedia

   en.wikipedia.org/wiki/Digital_Selective_Calling

   However for automated monitoring a second, receive-only antenna is often needed (especially on non-commercial leisure boats) since a separate tuner is used apart from the main one; [4] [5] this is separate from programming radios to monitor user-defined DSC frequencies (which would use the main antenna). [6] [7]

7. Inmarsat-C - Wikipedia

   en.wikipedia.org/wiki/Inmarsat-C

   The disadvantage is that voice communication is not possible with Inmarsat-C. [1] The service is approved for use under the Global Maritime Distress and Safety System , meets the requirements for Ship Security Alert Systems (SSAS) defined by the International Maritime Organization (IMO) and is the most widely used service in fishing Vessel ...