1.1 Ships of the following categories are required
to participate in the system proceeding to or from Polish ports or
passing through the reporting area between Polish ports in the Gulf
of Gdańsk, or ships visiting the area:
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all passenger ships as defined in
Chapter 1 of 1974 SOLAS, as amended;
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ships of 150 gross tonnage and above;
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all vessels engaged in towing.
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