Shore-based service that monitors and assists vessel movements in defined waters.
Regulatory detail & full definition
Three service levels: Information Service (INS), Traffic Organization Service (TOS), Navigational Assistance Service (NAS). Operates on dedicated VHF channels (commonly Ch 12, 14, 67); reporting points and traffic flow rules vary per system. IMO Res. A.857(20) governs international standards; major systems include Singapore VTIS, Dover Strait VTS, Houston VTS.
Source: IMO Res. A.857(20); SOLAS Ch. V Reg. 12; IALA V-103
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