In the simplest definition tugboats are small boats that push pull or tow other ships or barges which can not maneuver safely in their own.
Tugboat pulling ship. All on a sudden if a tugboat starts pulling a ship with full ahead nothing will happen rather than exerting huge tension in tow rope. That powers on par with the largest commercial tugboats available todayand about 15 tons more than what the average tug is rated to pull. When a ship is not being tugged the towing line will remain slack.
While the Ever Given floated doing its best not to move for risk of running aground again about a dozen tugboats pushed and pulled the. In a tug assist one or two tugboats meet the larger ship while it is still outside the port. Pilots guide the tug and monitor when to pull a ship at a certain angle.
Beyond this a square-rigger drifts with all its sail extended. Have a fleet of ships. Not unlike plane tugs.
The engines and propellers of those tugboats are comparable in size to those of the huge tankers. Tugboats which are often used to lead or tow other vessels can range in size from 50 feet to 250 feet in length. Mega ships are built for cruising huge distances with plenty of sea room around.
Tugboats are used for the same reason to pull ships or all sea going structures that cannot move on their own. But when its time to dock in ports their movements are constrained due to their enormous size. Tugboat dragging or pushing large roro roll onoff car or vehicle carrier ship vessel to quayside or seaport for loadunload car for shipping to worldwide.
A wide range of application includes towing or pulling vessels in narrow channels rescuing in case of break down or grounding pulling structures without propulsion systems etc. A tugboat is literally just a giant engine and propeller in the smallest boat possible. Escort Tugs which provide immediate assistance to giant container vessels are an essential part of port operations and will typically be placed behind a vessel and be attached to a towing line.