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2. Sea anchor - Wikipedia

   en.wikipedia.org/wiki/Sea_anchor

   A conical sea anchor with tripline (from an illustration in The Sailors Handbook by Halsey C. Herreshoff). An early wooden drogue. A sea anchor (also known as a parachute anchor, drift anchor, drift sock, para-anchor or boat brake) is a device that is streamed from a boat in heavy weather. Its purpose is to stabilize the vessel and to limit ...

3. Mooring (oceanography) - Wikipedia

   en.wikipedia.org/wiki/Mooring_(oceanography)

   The weight is released by sending a coded acoustic command signal and stays on the ground. Deep water anchors are typically made from steel and may be as large as 100 kg. A common deep water anchor consists of a stack of 2–4 railroad wheels. In shallow waters anchors may consist of a concrete block or small portable anchor.

4. Offshore embedded anchors - Wikipedia

   en.wikipedia.org/wiki/Offshore_embedded_anchors

   Water is then pumped from the interior of the caisson to create a vacuum that pushes the plate anchor underneath to the desired depth (Step 1). The plate anchor mooring line is then disengaged from the caisson, which is retrieved by water being forced into the caisson, causing it to move upwards whilst leaving the plate anchor embedded (Step 2).

5. Anchor - Wikipedia

   en.wikipedia.org/wiki/Anchor

   The elements of anchoring gear include the anchor, the cable (also called a rode), the method of attaching the two together, the method of attaching the cable to the ship, charts, and a method of learning the depth of the water. Vessels may carry a number of anchors: bower anchors are the main anchors used by a vessel and normally carried at ...

6. Watercraft - Wikipedia

   en.wikipedia.org/wiki/Watercraft

   An anchor or weight may be lowered to provide enough steerage way to keep in the best part of the current (as in drudging) or paddles or poles might be used to keep position. Human effort is used through a pole pushing against the bottom of shallow water, or paddles or oars operating in the surface of the water. Wind power is used by sails

7. Breakwater (structure) - Wikipedia

   en.wikipedia.org/wiki/Breakwater_(structure)

   Breakwaters may also be small structures designed to protect a gently sloping beach to reduce coastal erosion; they are placed 100–300 feet (30–90 m) offshore in relatively shallow water. An anchorage is only safe if ships anchored there are protected from the force of powerful waves by some large structure which they can shelter behind.