![]() ![]() It uses Self-Organizing Time Division Multiple Access (SOTDMA) technology to meet this high broadcast rate and ensure reliable ship-to-ship operation. The AIS is a shipboard broadcast system that acts like a transponder, operating in the VHF maritime band, that is capable of handling well over 4,500 reports per minute and updates as often as every two seconds. ![]() Or you can send to the ship, or receive from it, short safety-related email messages. Or you can dial it up directly using GMDSS equipment. other crucial ship data with all other nearby ships and vessel traffic services. Similar to a cell phone number, your MMSI number is your unique calling number for DSC radios or an AIS unit. With this information, you can call any ship over VHF radiotelephone by name, rather than by "ship off my port bow" or some other imprecise means. This white paper takes a closer look at the impact of AIS international. Maritime Mobile Service Identity (MMSI) is a unique 9 digit number that is assigned to a (Digital Selective Calling) DSC radio or an AIS unit. What You See With AIS (click on image above to enlarge in a new browser window) Display information previously available only to modern Vessel Traffic Service operations centers can now be available to every AIS user as seen below. Maneuvering information, closest point of approach (CPA), time to the closest point of approach (TCPA) and other navigation information, more accurate and more timely than information available from an automatic radar plotting aid, can also be available. By hovering over an AIS icon, you can learn the ship name, course and speed, classification, call sign, registration number, MMSI, and other information. Each ship "symbol" can reflect the actual size of the ship, with position to GPS or differential GPS accuracy. Changes do not take place until the next refresh. The marine AIS system adds greatly to safety at sea. WSDOT Traffic App WA.gov Office of the Governor Transportation. The AIS (automatic identification system) is used worldwide on seagoing vessels of all types to track individual craft and provide users with important information such as course, speed and position. A simpler map list is also available to select the map. Receive current traffic conditions, mountain pass reports, construction updates and more. 164.46 Automatic Identification System (a) Definitions. Imagine a shipboard radar or an electronic chart display that includes a symbol for every significant ship within radio range, each with a velocity vector (indicating speed and heading). Pan and zoom then double click on highlighted region to see AIS map. ![]()
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