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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 ...
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.
They also carry one or two long poles (quant/punting poles) are carried for use in shallow water, a small landing net and a wire hoop strung with cockle shells (kulit krang) on the end of a stick. This wire hoop is used for frightening the fish into the net by shaking it under the water when it makes a rattling sound.
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
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 ...
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.