Scope

Scope is the ratio between the length of anchor rode deployed and the vertical distance from the bow roller or chock to the seabed. In practice, that distance includes charted depth, tide height, and the boat’s freeboard, so a 5:1 scope means five metres of rode for every metre of effective depth.

Correct scope helps the anchor set and hold because it keeps the pull on the seabed low and near-horizontal. Too little scope can cause dragging; too much may create excessive swinging room in a crowded anchorage. It is planned alongside the Anchor Rode, Anchor, and expected Tidal Current.

Typical cruising guidance is around 5:1 in settled conditions, 7:1 for stronger wind or poorer holding, and more when weather or exposure demands it. PredictWind forecasts, gust maps, tide information, and routing tools help you judge likely loads, water depth changes, and whether an anchorage offers enough room to swing safely.