Which term is used for the heavy line, typically 5 inches or more, used for towing and mooring?

The term used for the heavy line, typically 5 inches or more in diameter, that is utilized for towing and mooring is known as a hawser. Hawsers are designed to bear significant loads and have the strength to withstand the forces involved in securing a vessel or towing it. They are crafted from robust fibers to ensure durability and reliability in marine operations.

In the context of naval operations and ship handling, understanding the specific function of a hawser is essential, as it is critical for safely securing a ship to a dock or another vessel. The proper application of a hawser is fundamental to safe seamanship and effective vessel management.