10 Yacht Mooring
Mistakes That Cost
Real Money
And how to fix every one of them
After nearly 40 years in the mooring products business, we’ve seen every mistake in the book. Some of them we’ve made ourselves. None of them are complicated to fix — and every single one costs far less to prevent than to repair.
Here are the ten most common.
The 10 Mistakes
Undersized Fenders
This is number one for a reason. We see it constantly: a 60-foot motor yacht with fenders that belong on a 30-footer. The fender compresses to nothing on contact, and the hull hits the dock anyway. The fenders are present but doing nothing useful.
One inch of fender diameter per 4–5 feet of yacht length. When in doubt, go one size bigger — a larger fender never caused a hull repair. Fender Size Guide →
Not Enough Fenders
Three fenders might be fine for a small sailing yacht in a calm marina. It is not enough for a 50-footer in an exposed berth, or for any yacht doing a Med stern-to alongside close neighbours. Gaps in coverage mean gaps in protection.
One fender per 10 feet of waterline, minimum. For Med stern-to berthing, carry at least six regardless of yacht size. Always keep one or two spares aboard.
Fenders Set Too High
If the bottom of your fender is two feet above the waterline, the bottom two feet of your hull are completely unprotected. That’s exactly where the dock edge tends to sit — and where the contact happens. This mistake is easy to miss because the fenders look deployed and everything seems fine.
Hang fenders so the bottom is just above the water surface. Check height after tidal changes on floating docks, and whenever you move to a new berth with different freeboard neighbours.
No Fender Covers
Bare PVC fenders leave scuff marks on gelcoat. It might not show the first time, but after a month in a marina berth with regular wake wash, you’ll see black marks running along the waterline. Over time, that marking becomes permanent discolouration and surface damage.
Neoprene fender covers on every fender. Non-marking, UV resistant, easy to clean, and they extend the life of the fender itself. Shop Fender Covers →
Mistakes 1–4 are all about fender selection and setup — the foundation. Get these right and you’ve eliminated the most common causes of dock-related hull damage before the lines are even tied.
Using the Wrong Line Material
Nylon stretches 15–25% under working load. If you’re using nylon breast lines in a marina berth, your yacht is bouncing around more than it should be, putting repeated dynamic loads on cleats and dock hardware. Nylon also degrades significantly faster in UV exposure — relevant when lines stay deployed for weeks at a time.
Use polyester for all marina mooring lines — low stretch, UV resistant, maintains strength when wet. Save nylon for anchor rodes and mooring balls where shock absorption is the point. Shop Mooring Lines →
Lines Too Tight
Mooring lines that are bar-tight put enormous static load on cleats, chocks, and dock hardware. When a wake or gust adds dynamic load on top of that, something gives — either the cleat pulls out, the chock bends, or the line itself parts. We’ve seen all three.
Leave enough slack for the yacht to move naturally without slamming. Floating docks need less slack. Fixed docks with significant tidal range need more — check that lines won’t go bar-tight at low water.
Lines Too Loose
The opposite problem. Excessively slack lines let the yacht drift far enough that fenders lose contact with the dock entirely, and the hull hits unprotected. You can have perfectly sized fenders in perfect position and still sustain hull damage if the lines are slack enough to let the boat drift past them.
Find the middle ground. The yacht should move gently with swell and wake, but fenders should stay engaged with the dock surface at all times. Check tension after any significant wind shift or change in conditions.
No Chafe Protection on Lines
A mooring line passing over an unprotected fairlead or chock will eventually chafe through. We’ve seen 20mm lines worn to half their diameter in a single season because nobody fitted a rope cover at the chafe point. The line looks fine at the cleat — the damage is hidden inside the fairlead where you can’t see it.
Neoprene rope covers on every line where it contacts metal or fibreglass — fairleads, chocks, rail edges. Protects both the line and the gelcoat beneath it. Shop Rope Covers →
Leaving Fenders Deployed While Underway
We know — you’re just going to the fuel dock and back. But UV exposure degrades fenders faster than anything else, trailing fenders create drag and can snag on buoys or debris, and it simply doesn’t look good. It’s also a signal to other mariners that you’re not paying full attention.
Stow fenders every time you leave the berth, no exceptions. With fender hooks it takes 30 seconds to pull them all in. Deploy again on approach — it’s a habit that costs nothing and protects both your fenders and your reputation on the water.
No Spring Lines
Bow and stern lines hold the yacht in place laterally. But without spring lines, the yacht surges forward and back with every wave, wake, and gust. This puts repeated shock loads on all your lines and fenders, accelerates chafe at every contact point, and — if the surge is large enough — lets the hull slam against the dock.
Always rig at least one forward spring and one aft spring line whenever leaving your yacht in a berth. In any kind of swell or tidal harbour, springs are not optional — they’re what keeps everything else working correctly.
The Cheap Insurance Principle
Every item on this list is a low-cost fix. Bigger fenders, neoprene covers, polyester lines, rope covers — none of these are expensive relative to the hull repairs, gelcoat resprays, or structural damage they prevent.
One good set of properly sized fenders with covers costs less than a single professional gelcoat repair. Rope covers cost less than a chafe-damaged mooring line. The maths is straightforward — the only question is whether you act before or after the damage happens.
After 40 years of watching yachts come and go in marinas across Europe, we’ve never once seen an owner regret spending money on proper mooring gear. We’ve seen plenty regret not doing so.
Fix Every Mistake on This List
Fenders, covers, polyester mooring lines, rope covers, and fender hooks — everything you need, from Yachtfend.