Pilot

One employed to steer a vessel; a helmsman; a steersman.

Specifically, a person duly qualified, and licensed by authority, to conduct vessels into and out of a port, or in certain waters, for a fixed rate of fees.

Figuratively: A guide; a director of another through a difficult or unknown course.

An instrument for detecting the compass error.

The cowcatcher of a locomotive.

To direct the course of, as of a ship, where navigation is dangerous.

Figuratively: To guide, as through dangers or difficulties.

something that serves as a model or a basis for making copies; "this painting is a copy of the original"

an inclined metal frame at the front of a locomotive to clear the track