Submarine

Submarine

A submarine is a watercraft capable of independent operation under water. It differs from a submersible, which has more limited underwater capability. The term submarine most commonly refers to large crewed autonomous vessel. however, historically or colloquially, submarine can also refer to medium sized or smaller vessels. Submarines are used for tourism, undersea archaeology, military etc. Civilian uses for submarines include marine science, salvage, exploration and facility inspection/maintenance. Submarine can also be modified to perform more specialized functions such as search and research mission or undersea cable repair.
Most large submarine consist of a cylindrical body with hemispherical ends and vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes.

Submarine

Automatic Submarine

Details

Maritime Pilot Boat

A Pilot is a mariner who guides ship through dangerous or congested waters, such as harbors or river mouths. Pilot are expert ship handlers who possess in depth knowledge of local waterways. Pilots are responsible under the law and maritime custom for conducting the safe navigation of the vessel. With the exception of the Panama Canal, the pilot is only an adviser, as the captain remains in legal command of the vessel.

                         Signal Flag H-Pilot on board

              

                     Signal Flag G-I required a Pilot

Pilot Boat

Pilot Boat