(With the extensive use of VTs and the continuous updating of its technology, VI S has played an important role in improving the traffic safety of ships, improving the flight efficiency of ships and protecting the environment. However, under the condition that the coastal environment is too poor and the location of the coastal radar base station is not ideal, some ships that need to bear the VI S service do not fly within the radar monitoring range, so VTS cannot fully display its functions. This limits the scope of water area served by VTS. This document includes the following annexes:)
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