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A brief primer on ocean shipping...

There are many kinds of ocean shipping, from giant oil tankers to passenger cruise lines to ships available on charter. The focus of this information is on the regularly scheduled freighter routes offered by liner carriers, as well as an important sub-group known as non-vessel-operating common carriers (NVOCCs). 

Liner Shipping
Liner shipping companies carry the freight of hundreds of exporters and importers on any one vessel. They also follow a regular schedule and specific routes that are repeated over and over. For example, a liner shipping company might follow a route that makes calls at New York, Norfolk, Charleston, Rotterdam, Bremerhaven, Felixstowe and Le Havre. If one round trip takes four weeks, a steamship could put four ships on the route and call each port once a week. Most liner carriers make weekly calls at each port, although the schedules vary considerably.
 
Shipping containers
Liner shipping companies move most of their freight in intermodal containers. These look like truck trailers, but the design allows them to be moved directly between trucks, trains, and ocean-going ships. The most common dimension for a container today is 40 feet long, eight feet wide and eight feet six inches tall. A typical containership can carry from 1,000 to 3,000 containers.

However, some ships are designed to carry other kinds of freight. There are the roll-on/roll-off ships that move cars, trucks and other kinds of wheeled equipment, so-called breakbulk ships that carry goods like long steel pipes, lumber, or large rolls of paper

The key is that these ships follow a schedule. With more than 100 shipping lines offering scheduled services between the U.S. and the rest of the world, exporters and importers need access to our comparative shipping schedules to understand their available options
 
NVOCCs
Many exporters ship less than a full container load to buyers overseas. These exporters often use non-vessel-operating common carriers, or NVOCCs, to move their cargo. NVOCCs, sometimes referred to as consolidators, specialize in combining several small shipments into

a single container load. NVOCCs can then place containers on the ships of liner carriers. Even though NVOCCs use the ships of other carriers, they are still legally responsible for a shipment, just like a vessel-operating carrier. 
 
 
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