center line - The imaginary line running from bow to stern along the middle of the boat.
certificate - A legal paper or license of a boat or its captain.
SHAFT ANGLE The angle between the center line of the shaft and the center line of the ship is the horizontal angle and the angle between the center line of the shaft and either the base line or the designed waterline is the vertical angle.
Keel - [image] (1) The backbone of a vessel, running fore and aft along the center line of the bottom of the hull; the timber at the very bottom of the hull to which frames are attached.
FORE AND AFT - The direction on a vessel parallel to the center line.
FORECASTLE - The raised part of the forward end of a ship's hull.
area HYDRO WIRE steel wire, normally used to support lightweight over-the-side sampling apparatus such as Nansen bottles, gravity corers, etc INSHORE near or toward the shore KEEL the backbone of a vessel, running fore and aft along the center line ...
Range Daymarkers are found in pairs with one higher than the other. Range markers indicate the center line of a channel by having them lined up as you pass through the channel. They will have vertical colored panels to assist in lining them up.
In a vessel, roll is rotation about the axis defined by the vessels fore-and-aft center line.
Rope - In general, cordage as it is purchased at the store. When it comes aboard a vessel and is put to use it becomes line.
 See also: Point, Forward, Keel, Running, Top
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