| http://www.w3.org/ns/prov#value | - System 10 is a first embodiment of the present invention, and comprises a main system 12 onboard a ship, an optional reference station 14, a satellite (SV) 16, a group of tailbouys 18, 20, 22, and 24, a reference link 26, a reference GPS downlink 28, a ship GPS downlink 30, a tailbuoy GPS downlink 32, and a group of tailbuoy VHF radio links 34,36, 38, and 40.
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