Tugboats are compact, highly powerful vessels that assist ships during berthing, unberthing and transit in confined waters, pushing or towing them with precision that large vessels cannot achieve on their own. Modern harbor tugs exert bollard pulls of 60 to 100 tons.
Most ports require or recommend tug assistance for large vessels, in combination with pilotage. Tug availability is part of the standard port facility data recorded in the World Port Index.
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