Anchoring looks simple from shore. It looks simple from the cockpit. Then the boat is in a crowded anchorage, 30 knots is building, the boat has dragged twice and is heading for the beach at Cascade Bay — and it suddenly seems more complicated than it looked.
Most anchoring problems are caused by a working short list of preventable errors. The PNW-specific version below. For the canonical working framework that applies anywhere, see Anchoring Techniques.
Gear
The anchor. For Puget Sound’s predominantly soft-mud bottom, a plow-type (CQR, Delta) or scoop-type (Rocna, Mantus, Spade) anchor is the working standard. Danforth anchors (lightweight aluminium-fluke design) work well in sand and mud but can fail to set in soft kelp or thick weed. For most boats in PNW waters, a Rocna or Mantus is the modern working default.
Sizing. Undersized anchors are the working leading cause of dragging. Use the manufacturer’s sizing chart for the displacement in the highest wind conditions the boat might encounter — and then go one size up. A 15-lb Rocna might be “right” for a 30-footer, but a 25-lb Rocna gives sleeping confidence.
Chain. All-chain rode is the working gold standard for cruising sailors. Chain’s weight helps the anchor lie horizontal on the bottom (keeping the angle of pull low), resists chafe on rocks, and requires less scope than rope to achieve equivalent holding. A working setup for a 35-ft boat is 200 ft of 5/16-inch G4 chain.
Scope. Scope is the ratio of anchor rode paid out to the depth of water (measured from the bow, not the surface). More scope = shallower pull angle = better holding. The working minimum in calm conditions: 5:1. Recommended standard: 7:1. In a storm: 10:1. In 20 ft of water at 7:1 scope, pay out 140 ft.
Accounting for tide. Puget Sound tidal range is up to 16+ ft in the South Sound. Anchor for the high-tide height, not the current depth. At low water in 10 ft with a 12-ft tide range, the anchor will be in 22 ft at high water — plan scope accordingly. See Tides & Currents for the working framework.
Setting the anchor
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Select the spot carefully. Look at other boats at anchor and identify how they are lying — that shows current direction. Choose a spot that gives the boat room to swing without hitting other boats as the current reverses. Account for the full scope circle.
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Approach into the current (or wind if stronger), not into the wind if current is dominant. In Puget Sound anchorages, current frequently dominates.
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Lower the anchor; do not throw it. Drop it over the side cleanly. Throwing risks tangling the chain.
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Back down slowly as scope is paid out. The rode should lie on the bottom behind the anchor as the boat backs up, pulling the anchor into the set.
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Snub the rode and back down at 1500 rpm for 30 seconds. Watch the rode — if it goes bar-taut and the boat stops, the anchor is set. If the bow swings or the rode vibrates, the boat may be dragging across the bottom.
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Take bearings. Identify two landmarks at 90° to each other. Watch them over 10 minutes — if they shift, the boat is dragging.
Working etiquette
First boat anchored has the right to swing room. A boat that anchors after you is responsible for being out of your swing circle. If a late arrival anchors too close, it is entirely appropriate to row over and politely ask them to move.
Don’t anchor in another boat’s swing circle. Look at the rode direction and the boats already there. Every boat in the anchorage will eventually swing through 360° — the spot must be clear of that sweep.
Don’t anchor in a fairway. Anchorages typically have a dinghy landing, boat traffic, and established paths. Don’t block them.
Sound the depth before setting. Check the depth and confirm the boat is not going to be in 8 ft at low water in a 10-ft-draft anchorage that looked deeper on the chart.
Set an anchor alarm. Every modern chart-plotter and phone navigation app (Navionics, iSailor, iNavX) has an anchor-alarm function. Set it to 50–100 ft beyond expected scope. If the boat drags, the alarm wakes the crew. Use it every time.
Closing notes
The PNW soft-mud bottom rewards a working modern scoop anchor with adequate chain and scope. The PNW tidal range demands the high-water-scope discipline. The PNW summer weekends demand the etiquette. Master those three and the boat sleeps soundly through the working summer.
For the canonical anchoring framework (rode physics, anchor types, the pre-set checklist), see Anchoring Techniques. For the working PNW anchorage shortlist, see Best Puget Sound Anchorages and Best San Juan Islands Anchorages.
Related: Anchoring Techniques · Best Puget Sound Anchorages · Best San Juan Islands Anchorages · Tides & Currents · Cruising Puget Sound