Ground Tackle Audit: A 30-Minute Inspection That Will Save Your Boat

Anchoring failures rarely involve the anchor itself. The Rocna or Mantus you bought to replace your CQR is probably still doing its job. What fails is the chain link that wasn't replaced after a hard set in coral, the snubber that's six years old and UV-cooked, or the windlass gypsy that's worn smooth and slipping under load. Run this audit once a season — preferably before your first overnight of the year — and you'll catch the failures before they catch you.

1. Anchor sizing — the actual numbers

Modern anchor manufacturers publish sizing charts that are more honest than the old standards. For a typical 38-to-42-foot cruising boat (roughly 18,000–22,000 lbs displacement), Rocna recommends a 25 kg (55 lb) anchor; Mantus M2 recommends 65 lb; Spade S100 sizes to 22 kg (49 lb). These are working anchors for 30-knot conditions. Storm sizing is one step up.

If you're carrying the anchor that came with the boat from a 1990s production builder, you're almost certainly undersized. Check the model and weight on your anchor, run it against the manufacturer's current chart, and if you're under, plan the upgrade. A new primary anchor is $400–800. A dragged anchor in a crowded anchorage with a lee shore is a haul-out.

2. Chain — link by link, not by length

Galvanized chain rusts from the inside out at the weld points. The visible rust on the outside is a lagging indicator. The way to inspect is to lay out the entire rode on the foredeck and walk it, looking for:

Pitting: any link with visible pitting deeper than 10% of the chain diameter is replaceable. For 5/16-inch (8 mm) chain, that's about 0.8 mm of pit depth.

Stretched links: a link that has noticeably elongated is a link that has yielded. It's done.

Wear at swivels: the first 10 links from the anchor see the most articulation. They wear faster than the rest of the chain.

Most cruising chains last 8–12 years in tropical use and 12–15 in cooler climates. If you don't know how old yours is, it's time. Re-galvanizing costs about $2.50/foot and adds 5–8 years; new G4 chain is about $7/foot.

3. Snubber — the link everyone forgets

The snubber takes the shock load that would otherwise fatigue the chain and the bow roller. For a 40-foot boat, that's typically 25–30 feet of 5/8-inch three-strand nylon, with a chain hook at one end and a hard eye at the other. The nylon stretches under load — that's the point. It absorbs the snatch loads from waves and gusts.

UV is the killer. Three years of full-time tropical use is about the lifespan. Check for: stiffness (should be supple, not crispy), surface fuzz (UV fiber breakdown), and inconsistent diameter (worn through outer sheath). A new snubber is $40 of line and a $20 chain hook. Replace it. Don't repair it.

4. Windlass and gypsy

The gypsy — the wheel that pulls the chain — is sized to match a specific chain pitch and link diameter. If you've changed chain manufacturers, even within the same nominal size, the new chain may not pocket properly. Test under load by hauling about 30 feet of chain with anchor weight and watching for slip or jump.

Common windlass issues: motor brushes worn (Lewmar V700/V900 expect about 800 hours of brush life), foot switch corrosion (a $15 fix, but ignore it and you have no windlass at the worst possible time), and gypsy clutch slipping (re-tension or replace).

5. Bridle hardware

If you're using a bridle on a catamaran or a single-leg snubber on a monohull, inspect the chain hook. The Mantus chain hook is the gold standard; the cheap stamped hooks bend. Replace any hook with visible deformation.

The 30-minute version

Lay out the rode. Walk the chain. Inspect the snubber by feel. Test the windlass under load. Look at the chain hook. Confirm anchor sizing against current manufacturer charts. Done. You've eliminated 90% of the failure modes that drag boats onto rocks.

One more thing: photograph your setup, with measurements, and put the photo somewhere you can find it. When the insurance adjuster shows up after the storm, you'll be glad you have it.