Abstract
As there are more and more Automatic Identification System (AIS) sets being deployed onboard, it is getting easier for people to trace vessels. Today, many online vessel monitoring services have been developed; however, most of them are based on AIS information. Because the coverage limitation of VHF frequency, which the AIS set works on, is normally no more than 25 nautical miles, these systems cannot track vessels when they are beyond the coverage of the shore-based AIS station. In order to track vessels in all sea areas, the authors developed a comprehensive vessel tracking system, namely ManyShips, which integrates AIS, Inmarsat and China Beidou navigation satellite system. The running result of the system shows that the Beidou satellite system can track vessels within Asian-Pacific region while the Inmarsat-C station polling service can help people tracking vessels within sea area A3.
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