Heavy-duty wire used to lower heavy instruments overboard from the trawl winch.

In wooden ship construction, these were cylindrical pins of oak which were used to secure the planks to her timbers. Pronounced "trennels".

Two short pieces of timber fixed horizontally fore and aft on each side of the lower masthead of a square rigged vessel and used to support the topmast, the lower crosstrees, and the top.

A stay leading from one mast, such as the main mast to another, such as the mizzen mast.

To lash up.

A line used for suspending articles.

The time allotted to a man to stand at the helm.

A spell of duty connected with the navigation of a vessel; more particularly, at the wheel or look-out.

The period of time during which the wheelsman remains at the wheel.

A running light allowed on some sailboats instead of the normal bow and stern lights. The tricolor light contains the red and green side lights and the white stern light in a single fitting that is attached to the top of the mast.

(1) To adjust the sails for best advantage. (2) Fore and aft balance of a boat. If either the bow or stern is depressed, the vessel is said to be down by the bow or down by the stern. (3) To trim is to adjust. It does not just apply to sheets. You can tri ...

The angle to the horizontal at which a vessel rides.

An adjustable section of the rudder that allows the rudder to be corrected for lee helm or weather helm.

A multihulled boat with three hulls.

To let go.

The act of breaking out the flukes of an anchor if they are caught on some obstruction, preventing it from being normally weighed.

A line attached to the crown of an anchor and used to help free it in the event it becomes fouled.

A line used for capsizing the sea anchor and hauling it in.

The region around the equator between the Tropic of Cancer and the Tropic of Capricorn. The tropics are known for their warm weather.

The bottom of a wave, the valley between the crests.