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A sea anchor is deployed off the bow and a drogue is deployed off the stern. The sea anchor keeps the bow up to weather, a drogue is usually smaller, and allows you to move downwind while acting as a brake. Each has wide variations in the sizes used, and this affects their specific role in sea survival.
Choosing the Right Anchor. Even though anchors are used most often by recreational boaters to park their boat while swimming or fishing, anchors are also critical equipment in times of emergency. Anchoring may be a safety measure if your boat becomes disabled. Choose an anchor that fits your boat and the boating conditions. The plow-style anchor is good for most boats and gets its holding power by plowing into bottom sediment. The fluke-style anchor (commonly referred to as Danforth) is similar to the plow style but is more lightweight.