A Tugboat is a vessel that maneuvers other vessels by pushing or pulling them either by direct contact or by means of a tow line. Tugs typically move vessels that either are restricted in their ability to maneuver on their own, such as ships in a crowded harbor or a narrow canal, or those that cannot move by themselves, such as barges, disabled ships, log rafts, or oil platforms. Tugboats are powerful for their size and strongly built, and some are ocean-going. Source Wikipedia
In this category there are dwg files useful for the design of seaports or large marinas: drawings of tugs in 2D and 3D format with different types and sizes.
Wide choice of files for all the designer's needs.
See the Maritime Ports
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