TUG
Sea Going Tug
A vessel equipped with a towing winch to tow other vessels in the open sea and with maneuvering capabilities to assist vessels to berth/unberth in ports. May also be able to push barges and other vessels.
Harbour Tug
A vessel equipped with a towing winch to tow other vessels in harbour and with manoeuvring capabilities to assist vessels to berth/unberth in ports. May also be able to push barges and other vessels.
Inland Tug
A vessel designed for tug, towing, or pushing operations. Not designed for operation in the open sea.