River Traffic Tracking

The River Traffic Info (RTI) is an open, community based project dedicated in collecting and providing real-time and historical information to the public about ship movements and ports, mainly across the United States and Europe rivers.

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Recording the vessels positions

The International Maritime Organization (IMO) requires all vessels over 299GT to carry an AIS transponder on board, which transmits their position, speed and course, among some other static information, such as vessel’s name, dimensions and voyage details.

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The Range of the AIS

Normally, vessels with an AIS receiver connected to an external antenna placed on '49.21' feet above sea level, will receive AIS information within a range of 15-20 nautical miles. Base stations at a higher elevation, may extend the range up to 40-60 NM, even behind remote mountains, depending on elevation, antenna type, obstacles around antenna and weather conditions.

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About Automatic Identification System (AIS)

AIS is intended to help ships avoid collisions, as well as assisting port authorities to better control river and sea traffic. AIS transponders on board vessels include a GPS (Global Positioning System) receiver, which collects position and movement details. It includes also a VHF transmitter, which transmits periodically this information on two VHF channels (frequencies 161.975 MHz and 162.025 MHz – old VHF channels 87 & 88) and make this data available to the public domain.

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Data Update

Data received is uploaded in the database in real-time and therefore its immediately available on AGT's system. However, several positions show on map may be not continuously refreshed (e.g. when a ship goes out of range). Vessel positions shown on map may be up to 1 hour old.