Definition
Tugs are engaged for berthing, unberthing and turning where wind, stream or confined water exceed the vessel's own control, particularly on high-sided ships at low speed when the rudder has little effect. They work made fast forward and aft, or pushing on the shoulder and quarter, and their capability is quoted as bollard pull in tonnes. Escort tugs work astern to steer or retard a laden tanker. Speed must be reduced before a tug makes fast.
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