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  2. Automatic identification system - Wikipedia

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

    AIS is intended to assist a vessel's watchstanding officers and allow maritime authorities to track and monitor vessel movements. AIS integrates a standardized VHF transceiver with a positioning system such as a Global Positioning System receiver, with other electronic navigation sensors, such as a gyrocompass or rate of turn indicator. Vessels ...

  3. Emergency position-indicating radiobeacon - Wikipedia

    en.wikipedia.org/wiki/Emergency_position...

    Overview diagram of COSPAS-SARSAT communication system used to detect and locate ELTs, EPIRBs, and PLBs First generation EPIRB emergency locator beacons. An emergency position-indicating radiobeacon (EPIRB) is a type of emergency locator beacon for commercial and recreational boats, a portable, battery-powered radio transmitter used in emergencies to locate boaters in distress and in need of ...

  4. Search and rescue transponder - Wikipedia

    en.wikipedia.org/wiki/Search_and_rescue_transponder

    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. These devices may be either a radar-SART, or a GPS-based AIS-SART (automatic identification system SART).

  5. AIS-SART - Wikipedia

    en.wikipedia.org/wiki/AIS-SART

    These devices may be either an AIS-SART (AIS Search and Rescue Transmitter) (from January 1, 2010), or a radar-SART (Search and Rescue Transponder). The AIS-SART derives position and time synchronization from a built in GNSS receiver. Once per minute, the position is sent as a series of eight identical position report messages (four on 161.975 ...

  6. Emergency locator beacon - Wikipedia

    en.wikipedia.org/wiki/Emergency_locator_beacon

    ENOS Rescue-System. A rescue beacon system designed for use by divers who have drifted away from their dive boats. Search and rescue transponder (SART) . A specialized radar beacon (RACON) that emits a string of 12 dots (replaced by arcs and circles when closer) for display on an X-band radar screen when scanned.

  7. Blue sign - Wikipedia

    en.wikipedia.org/wiki/Blue_sign

    Article 3.03 states that the board must be rectangular and 1-metre × 1-metre for large vessels, or 0.6-metres × 0.6-metres for small vessels. [7] The presence and status of the blue sign is transmitted by the ship's Inland-Automatic Identification System (Inland-AIS) transponder to other vessels.