Motion relative to a specified or implied reference point which may itself be in motion. The expression usually refers to movement of celestial bodies as observed from the earth. Usually called RELATIVE MOVEMENT when applied to the motion of one vessel relative to that of another. Also called RELATIVE MOTION.

Related Terms

AFT

Back of the vessel.

ASTERN

A backward movement of a vessel

ATHWARTSHIP

Across the ship, at right angles to the fore-and-aft centerline

UPBOUND

A vessel traveling upstream.

BEAM

The width of a ship. Also called breadth.

BREADTH

The width of a ship.

AFFREIGHTMENT

A hiring of a vessel

COMPRESSOR

A device which converts mechanical force and motion into pneumatic flow power.

JOURNAL BEARING

A sliding type of bearing having either rotating or oscillatory motion and in conjunction with which a journal operates. In a full or sleeve type journal bearing, the bearing surface is 360° in extent. In a partial bearing, the bearing surface is less than 360° in extent, i.e., 150°, 120°, etc.

CATAMARAN

A double hulled vessel

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