Anchor Windlass Buying Guide: Size, Style and Gypsy Matching

By Boat Supplies Direct·Updated Oct 18, 2026·6 min read

Vertical anchor windlass on a boat's bow with chain to the anchor roller

Quick answer: Choose a windlass with a pulling power of at least 3 times the combined weight of your anchor and all of your rode, and size up for heavy boats or high windage. Then match the gypsy to your exact chain size and grade (and rope diameter on rope-chain models), confirm your anchor locker has enough depth for the rode to fall into (about 18 in below the deck for a vertical windlass, about 12 in for a horizontal), and wire it with heavy cable, a dedicated breaker and a solid battery supply.

A windlass turns anchoring from a back-breaking chore into a push-button job, and it lets one person anchor safely. It is also one of the biggest electrical loads on the boat and one of the easiest pieces of gear to buy wrong. A windlass that doesn't match your rode will slip, jam or chew up chain. This guide walks through sizing, style, rode matching and installation.

Step 1: Add up your ground tackle weight

Weigh, or look up, everything the windlass must lift: the anchor, all the chain, and the rope. Multiply by 3 for the minimum pulling power.

Ground tackle weight	Minimum pull (3x)
100 lb	300 lb
200 lb	600 lb
300 lb	900 lb
400 lb	1,200 lb

A heavy boat, a lot of windage, or anchoring in strong current puts more load on the windlass, so go bigger. A windlass is meant to lift the anchor, not to pull the boat up to it. Motor up to the anchor as you retrieve.

Step 2: Vertical or horizontal?

Vertical: the motor sits below deck and the gypsy above. The chain wraps about half the gypsy, so it grips well and slips less. Clean look. Needs a deeper locker, roughly 18 in of fall below the deck, and access below to install and service.
Horizontal: the whole unit sits on deck. Easier to install and maintain, good for shallow lockers with about 12 in of fall. Often includes a capstan drum for dock lines.
Free-fall drum windlasses: common on center consoles and smaller boats. They wind rope or rope and chain onto a drum and drop the anchor by gravity at the push of a button.

Step 3: Match the gypsy to your rode

This is the most common windlass mistake. The gypsy must match your exact chain size and grade. G4 (high test) and BBB chain of the same nominal size have different link dimensions, and the wrong combination slips or jams. Rope-chain gypsies also specify a rope diameter, and they work best with a properly spliced rope-to-chain connection and the recommended rope type. Check the windlass spec sheet before buying chain, or buy a matched rode.

Step 4: Check the anchor locker

The rode needs room to fall straight down and pile up without blocking the gypsy.
The locker must drain so wet rode doesn't sit in water.
Your bow roller must fit the anchor and line up with the windlass.

Step 5: Wire it for a big load

Windlasses draw a lot of current. Follow the manufacturer's cable size chart for your round-trip run, which is often long on a bow install.
Install a dedicated circuit breaker sized to the windlass, plus a solenoid or control box and helm or deck switches.
Many boats add a battery near the bow to shorten the cable run. Run the engine while using the windlass to keep voltage up.
See our wire and terminal guide for cable and lug sizing.

Step 6: Use it safely

Never ride at anchor with the load on the windlass. Use a chain stopper or snubber to a cleat.
Keep fingers, hair and loose clothing clear of the gypsy.
Secure the anchor at the bow with a safety strap or pin when underway.
Carry the emergency crank handle in case of an electrical failure.

Common windlass mistakes to avoid

Buying chain before checking the gypsy. Order the chain the windlass maker specifies, or buy a matched rode.
Undersized cable on a long bow run. Voltage drop starves the motor, so it labors, overheats and trips the breaker. Follow the cable chart.
Using the windlass to pull the boat to the anchor. Motor slowly up to the anchor and let the windlass lift.
Breaking out a stuck anchor with the windlass. Cleat off the rode and use the boat's momentum to free it instead.
Too little fall in the locker. Rode piles up under the gypsy, jams, and the windlass stalls.
Running it with the engine off. Keep the engine running so the alternator supports the battery during the heavy draw.

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Frequently Asked Questions

What size windlass do I need for my boat?

One rated to pull at least 3 times the total weight of your anchor, chain and rope. Size up for heavy boats, high windage or strong current.

Vertical or horizontal windlass, which is better?

Vertical windlasses grip the chain better and look cleaner but need a deeper locker and below-deck access. Horizontal units install and service more easily and fit shallow lockers.

Why does my windlass slip on the chain?

Usually the chain doesn't match the gypsy. G4 and BBB chain of the same nominal size have different link dimensions. Match the chain size and grade to the gypsy.

Can I use any rope with a rope-chain windlass?

Use the rope type and diameter the windlass maker specifies, with a proper rope-to-chain splice. Wrong rope can slip or jam in the gypsy.

Do I need a separate battery for my windlass?

Not always, but on many boats a bow battery shortens a long, heavy cable run. Either way, use the cable size and breaker the manufacturer specifies.

Can a windlass hold the boat at anchor?

No. Take the load off the windlass with a chain stopper or snubber line to a cleat once the anchor is set.

This guide is general information. Follow the windlass manufacturer's sizing, wiring and installation instructions, and have a qualified marine technician handle the electrical install if you are unsure.