A line used to hoist or lower a sail, flag or spar. The tightness of the halyard can affect sail shape.

A member of the ship's crew.

A hand hold. Usually along the cabin top or ladder.

A pump which is used to deliver air to the aquarium. The pump pushes air through silicon tubing and to air stones or other aquatic decor. They are also an essential for UGF's (undergravel filters). An air stone is placed in each clear tube. When the air b ...

In navigation, the angle between the point at which the sun rises and sets and the true east and west points of the horizon.

The original name for the left side of the vessel when facing forward. The name was changed to Port to avoid any confusion with starboard, the right side of the vessel when facing forward.

A movement of equipment from an origin rail ramp to a destination rail ramp only.

The line by which a boat is connected to a mooring buoy; a short rope hanging from a spar having at its free end a spliced thimble or a block. Sometimes called "Pennant".

A type of anchor with a heavy inverted mushroom shaped head. Mushroom anchors are used to anchor in mud and other soft ground.

An enterprise in which there is a risk of loss.

International Labor Organization; Based in Geneva, it is one of the oldest components of the UN system of specialized agencies and has been involved over the years in appraising and seeking to improve and regulate conditions for seafarers. In its unusual ...

The person who is in charge of a vessel and legally responsible for it and its occupants.

International Convention on Oil Pollution Preparedness,Response and Co-operation, IMO

The distance between the water level at chart datum and an overhead obstacle such as a bridge or power line.

A compressor belonging to the group of dynamic compressors. Characterized by having its flow in the axial direction.

Thread - Unified national coarse.

Before the introduction of man-made fibers, much of the rope used at sea was made from manila. Made from the fibers of banana plants in the Philippines, manila did not rot when it was exposed to seawater.

Standard pressure and temperature. See standard air.

Bareboat (Method of chartering of the ship leaving the charterer with almost all the responsibilities of the owner.)

The distance between a rope's adjacent strands, giving a measure of the tightness of the lay. The shorter the distance, the harder the lay. When a line has been overused and the lay has become slack, it is said to be slack-jawed.