Sea vessels that do not operate on regular times and routes are
Answer Details
Sea vessels that do not operate on regular times and routes are called tramps. Tramp ships are essentially freighters that do not have a fixed schedule or specific ports of call. Instead, they are hired by cargo owners or shipping companies to transport goods to various destinations around the world.
Tramp ships are often used to transport bulk cargo, such as coal, grain, or ore, and are known for their flexibility and cost-effectiveness. Because they do not have fixed schedules, tramp ships can be hired at short notice and can be rerouted to different destinations as needed.
In contrast, ocean liners, container ships, and ferries all operate on regular routes and schedules. Ocean liners are large passenger ships that transport passengers and cargo on fixed routes, while container ships are used to transport standardized shipping containers on specific routes. Ferries, on the other hand, are typically used to transport passengers and vehicles across shorter distances, such as between nearby ports or islands.
Overall, tramp ships provide a valuable service for companies that need to transport goods around the world, but do not require the regular schedules or specific routes of other types of ships.