Harbour pilot

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Signal flag H(Hotel) - Pilot on Board
Signal flag H(Hotel) - Pilot on Board
Boarding is tricky, as both vessels are moving and cannot afford to slow down.
Boarding is tricky, as both vessels are moving and cannot afford to slow down.
Pilot boat Apollo, Rotterdam, is equipped with many railings to give pilots handholds while transferring.
Pilot boat Apollo, Rotterdam, is equipped with many railings to give pilots handholds while transferring.

A harbour pilot guides ships through the narrow, shallow and dangerous coastal waters between a harbour and the open sea.

A highly coveted and potentially dangerous position, a pilot is a master mariner with many years of experience in the harbor that they are licensed to operate in.

Most harbors require vessels of a certain size to take on a pilot, at which point the pilot effectively controls the movements of that ship. Legally the master remains in command of the ship. The pilot is an adviser only.

Normally the pilot joins an incoming ship at sea via pilot boat and climbs a swaying rope ladder sometimes up 40 feet to the deck of the largest container and tanker ships. With outgoing vessels, a pilot boat returns the pilot to land after the ship has successfully negotiated coastal waters.

Pilots specifically use the pilotage techniques relying on nearby visual reference points and local knowledge of tides, swells, currents, depths and shoals that might not be readily identifiable on the nautical charts without first hand experience in the harbor in question.

Due to their size and mass, most large ships are very difficult to maneuver; the stopping distance of a supertanker is typically measured in miles and even a slight error in judgement can cause millions of dollars in damage.

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Pilot boat Mount Stuart heads out on the Firth of Clyde.
Pilot boat Mount Stuart heads out on the Firth of Clyde.


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