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To aid in the stability of SPMDs, various ways can be employed including attaching the device to a buoy system, an anchor, a boat, or structures/debris in shallow water. For the best possible data to be collected using passive samplers, some degree of stability and the ability of the SPMD to be stationary are required.
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.
Single anchor leg mooring (SALM), which can be used in both shallow and deep water. [1] see Thistle SALM as an example. Vertical anchor leg mooring, which is seldom used. [1] Two types of single point mooring tower: Jacket type, which has a jacket piled to the seabed with a turntable on top which carries the mooring gear and pipework [1]
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 ...
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 ...