Sea Anchors

What Is a Sea Anchor and Why Does Every Mariner Need One?

Sea anchors — also called para-anchors, drift socks, drift anchors, or boat brakes — are among the most important pieces of safety gear a boater can carry. A sea anchor is a device streamed from a boat in heavy weather whose purpose is to stabilize the vessel and limit progress through the water. Rather than tethering the boat to the seabed like a conventional anchor, it provides hydrodynamic drag, acting as a brake. Normally attached to a vessel's bow, a sea anchor can prevent the vessel from turning broadside to the waves and being overwhelmed by them.

Sea Anchors vs. Drogues: Understanding the Difference

These two devices are closely related but serve distinct purposes, and using the wrong one at the wrong time can be dangerous. The primary use of a sea anchor is to stop the drift of a vessel downwind and keep her bow windward, into the waves. Sea anchors are set off the bow and are used in open seas where ground tackle is not possible or practical, to hold position in moderate to high winds and seas.

A drogue, on the other hand, is used to slow down rather than stop a vessel in following seas. Drogues are deployed off the stern, keeping the boat stern-to the waves and reducing the chances of broaching or pitchpoling. A drogue can also be used as a steering assist in case of power and/or rudder problems, and fishers use drogues to slow their drift for trolling without a motor.

When Should You Deploy a Sea Anchor?

Sea anchors are often deployed to wait out a storm, or in emergencies when there is a loss of power and you need to keep the boat from turning beam to the waves or drifting into obstacles such as shoals. Deployed from the bow on a long line approximately three to four times the boat's length, the sea anchor keeps the bow into the wind and waves, and can also reduce movement across ground to a near stop — crucial with a loss of power near shore with wind and waves pushing the boat toward land.

Fishermen often use sea anchors to slow down a drift, sometimes deploying them from the windward beam to make the boat drift side-to the waves, allowing drifted baits to spread out along the entire length of the boat.

What to Look for When Choosing a Sea Anchor

Modern commercial sea anchors are usually made of cloth, shaped like a parachute or cone, and rigged so that the wider end leads and the narrower end trails. When deployed, this type of sea anchor floats just under the surface, and the water moving past keeps it filled. Several manufacturers produce high-quality versions of these devices, typically with ratings for different-size vessels and correspondingly sized sea anchors.

• Size: The size of the sea anchor determines how much water it can displace and how much braking it can provide.
• Rode: Nylon rope is widely used for hauling sea anchors since it best absorbs shock loading by stretching.
• Trip Line: Most larger sea anchors provide a mechanism to collapse the anchor for retrieval, called a trip line, which attaches to the rear of the anchor and allows it to be pulled in back first, shedding water rather than filling.
• Swivel: Drift anchors tend to turn in the water, so use a stainless steel swivel between anchor and rode.

Top Brands in Sea Anchors

Cal June Buoys is a well-established name in marine safety equipment. Cal-June, also known as Jim-Buoy, is a staple in the marine industry for safety and mooring equipment, with sea anchors manufactured to meet strict USCG standards for both commercial and recreational use. Their sea anchors feature vinyl-coated nylon construction with polypropylene shroud lines and easily collapse for storage.