Module 3 of 17
Anchorwork
Anchoring considerations and characteristics of different anchor types.
Choosing an Anchorage
A good anchorage offers shelter from the wind and sea, adequate depth (allowing for tidal range), good holding ground (sand or mud), enough room to swing, and a clear approach free from hazards. Consider the forecast — if the wind is due to shift, will you still be sheltered?
Avoid anchoring in fairways, near moorings, cables (marked on the chart), or in environmentally sensitive areas like seagrass beds. Check the chart for designated anchorage areas (anchor symbol).
Key Points
- Shelter from wind and sea
- Adequate depth for tidal range + vessel draft
- Good holding ground (sand or mud preferred)
- Room to swing without hitting other vessels or the shore
- Avoid cables, fairways, moorings, and seagrass
Anchor Types
Different anchor designs work better in different seabed types. The CQR (plough) anchor performs well in sand and mud and sets reliably. The Bruce (claw) anchor is good all-round and self-rights easily. The Danforth (fluke) anchor has excellent holding in sand and mud but can struggle in weed or rock.
Modern anchors like the Rocna and Mantus have improved on older designs with faster setting and higher holding power per kilogramme. Whatever anchor you use, it must be heavy enough for the size of boat and conditions.
Key Points
- CQR (plough) — reliable in sand and mud, widely used
- Bruce (claw) — good all-round, self-rights easily
- Danforth (fluke) — excellent holding in sand/mud, poor in weed/rock
- Modern designs (Rocna, Mantus) — fast setting, high holding power
- Anchor must be appropriate size and weight for the vessel
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