Ground Tackle: How a Boat Holds Its Ground

"Ground tackle" is the whole system that keeps your boat where you dropped it: the anchor, the rode (the line and/or chain connecting anchor to boat), plus the shackles and swivels joining them. A common beginner myth is that the anchor holds by its weight. It doesn't — a modern anchor holds by digging into the seabed, and it can resist forces many times its own mass.

Anchors come in families suited to different bottoms. A plow or scoop type (e.g. CQR, Delta, Rocna) buries a single fluke and resets well when the wind shifts. A fluke/Danforth anchor uses two broad flat blades for huge holding power in sand and mud, but struggles on rock or grass. Matching anchor to seabed matters more than sheer size.

The rode is where chain vs. rope decides everything. Chain is heavy, so its weight sags into a curve called the catenary; this keeps the pull on the anchor nearly horizontal, which is exactly what makes a fluke bite instead of tugging upward and popping out. Rope (nylon) is light and cheap and stretches to absorb shock loads, but it floats the pull higher — so most cruisers use an all-chain rode, or rope with a heavy chain leader (often 5–10 m) at the anchor end.

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So the goal of good ground tackle is a low, horizontal pull on a well-matched anchor — a theme the next cards build on when we talk about scope and setting the hook.