Quark-Elec QK-A051T Manual
Also see for QK-A051T: Setup guide
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Contents
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Quark-elec Manualhttps://www.quark-elec.com 3 of 18 2019V1.01. IntroductionThis manual provides installation procedures, configuration and safety instructions for the A051T Class B Transponder.1.1. How AIS WorksAIS stands for Automatic Identification System. AIS is a location and vessel information reporting system. It allowsvessels equipped with AIS to automatically and dynamically share and regularly update their position, speed overground (SOG), course over ground (COG) and other information such as vessel identity with similarly equipped craft.The marine Automatic Identification System (AIS) is a location and vessel information reporting system. It allowsvessels equipped with AIS to automatically and dynamically share and regularly update their position, speed, courseand other information such as vessel identity with similarly equipped craft. Position is derived from a Global NavigationSatellite System (GNSS) network and communication between vessels is by Very High Frequency (VHF) digitaltransmissions. A sophisticated and automatic method of time sharing the radio channel is used to ensure that evenwhere a large number of vessels are in one location, blocking of individual transmissions is minimised, anydegradation of the expected position reporting interval is indicated to the user and even if the unit suffers extremechannel overload conditions it will always recover to normal operation.1.2. AIS ClassesThere are two classes of AIS transponders that can be fitted to vessels, Class A and Class B. In addition AIS basestations may be employed by the Coastguard, port authorities and other authorized bodies. AIS units acting as aids tonavigation (AtoNs) can also be fitted to fixed and floating navigation markers such as channel markers and buoys.Class A units are a mandatory fit under the safety of life at sea (SOLAS) convention to certain vessels types, includingthose above 300 gross tons or which carry more than 11 passengers in International waters. Many other commercialvessels and some leisure craft also fit Class A units. Class A AIS units transmit the radio signal at a power level of12.5 watts, while class B is at 2 watts. Class B units are currently not a mandatory fit but authorities in several parts ofthe world are considering this. Class B units are designed for fitting in vessels which do not fall into the mandatoryClass A fit category, but who still desire or are required for other reasons to transmit their AIS location.Quark-elec A051T is a class B transponder.A Class A unit will transmit its IMO number (if known), MMSI, Call sign and Name, length and beam, ship type, time,course over ground (COG), speed over ground (SOG), heading, navigational status, rate of turn, draught, cargo type,destination and safety related messages via NMEA transmit facility. Message lengths are variable with static andvoyage related information being transmitted less often.Class A ship messages reporting intervalsShips dynamic conditions RateShip at anchor or moored 3 minShip 0-14 Knots 10 secShip 0-14 Knots and changing course 3.3 secShip 14-23 Knots 6 secShip 14-23 Knots and changing course 2 secShip > 23 Knots 2 secShip > 23 Knots and changing course 2 secShips Static Information 3 minA Class B AIS unit is designed to be interoperable with Class A units, but not to impact the Class A network. Manycommercial vessels, fishing boat, leisure craft, not classified as requiring a Class A unit, choose to install a Class Bunit to avoid accidents at sea. A Class B unit will transmit its MMSI, Call Sign and Name, length and beam, ship type,time, course over ground (COG), speed over ground (SOG) only.Class B ship messages reporting intervalsShips dynamic conditions RateShip with Speed Over the Ground < 2 Knots 3 minShip with Speed Over the Ground > 2 Knots 30 secShips Static Information 3 min |
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