down haul

A line used to control either a mobile spar, or the shape of a sail.

anchor line

cleat

A stationary device used to secure a rope aboard a vessel.

runners (running backstays)

Long lines or cables, reaching from the rear of the vessel to the mast heads, used to support the mast.

bloc

A block is a single or multiple pulley. One or a number of sheaves are enclosed in an assembly between cheeks or chocks. In use a block is fixed to the end of a line, to a spar or to a surface. Rope or line is rove through the sheaves, and maybe through one or more matching blocks at some far end to make up a tackle.

jack line

or Jack Stays – Lines, often steel wire with a plastic jacket, from the bow to the stern on both port and starboard. The Jack Lines are used to clip on the safety harness to secure the crew to the vessel while giving them the freedom to walk on the deck.

wheel

The wheel of a ship is the modern method of adjusting the angle of the rudder, in turn changing the direction of the boat or ship. It is also called the helm, together with the rest of the steering mechanism.

harness

starboard

Towards the right-hand side of a vessel facing forward. Denoted with a green light at night.