Tugs or tug boats and tows or tow boats are used for towing or pushing non-propelled equipment:

• going to and from project sites,
• to move hopper barges into position beside a dredger,
• to push or tow hopper barges to the discharge location,
• to assist large dredgers when they have to reposition or move to sheltered waters,
• to shift anchors on site,
• to transfer personnel on and off dredgers, and
• to deliver stores and consumables.