Abstract: Maintaining a catamaran in the British Virgin Islands (BVI) is a completely different matter from doing so in the Mediterranean or on the U.S. East Coast—the two are worlds apart.I’ve been working on BVI charter routes for five years. At first, I was completely lost and knew nothing, but eventually I learned to solve most of the tricky problems on my own. If I were to record all the setbacks I encountered during that time, they would be enough to fill an entire nautical logbook.This article dispenses with the verbose and empty rhetoric found in official manuals; and instead presents my own genuine experiences—such as how to choose the right bottom paint, why the freshwater system always emits a strange odor, and how to handle a windlass that’s jammed in coral sand.If you’re planning to lease or purchase a catamaran long-term in the BVI, this article will likely save you thousands of dollars and countless frustrating afternoons.
Note from the author: I’m Rick, a North American and an amateur sailor. Since 2019, I’ve spent at least six months a year in the BVI. I’ve single-handedly maintained two catamarans—a Leopard 45 and a Lagoon 42—and have also helped friends manage several charter boats.I don’t have a captain’s license or a degree in marine engineering—I rely entirely on the hands-on experience I’ve gained over the past five years of enduring the sun, drinking dirty water, and taking apart broken parts. This article does not endorse any specific brands and contains no affiliate links.
Salt. Nothing but salt. There’s no escaping it.
Honestly, that summer, when I first docked the catamaran at Road Harbour, I felt like I’d accomplished something truly amazing. But by the third day, I was standing on the deck, staring blankly at the rusty rigging.
Here in the British Virgin Islands, the air’s humidity hovers between 75 and 85 percent year-round, the seawater is 30 degrees Celsius, and the salt concentration in the air is so high that it feels like you can taste the salt in every breath.If you pour a cup of fresh water onto the deck, it dries up in less than ten minutes, leaving a white ring behind.
Stainless steel fittings that would last two or three years in Florida start to show spots here after just half a year.I once witnessed a well-maintained Lagoon 380 whose entire navigation system suddenly lost power while underway, simply because the owner had failed to check for corrosion at the cable terminals. That day, with winds at 25 knots, they nearly ran aground on a reef near The Dogs.
So, the first rule is: never assume that stainless steel won’t rust. In the British Virgin Islands, 304 stainless steel is practically a joke; 316L is barely adequate. The only truly effective solution is to regularly rinse all metal parts with fresh water.Yes, I know this sounds incredibly silly—on an island where fresh water costs more than beer, you’re actually supposed to use fresh water to wash your boat.However, if you save those few gallons of water, the cost of replacing a tiller handle or a set of battery terminals down the road will be enough to buy enough fresh water for two boats.
Here’s what I do: Every time I’m on my way back to the anchorage, I use the deck pump to fill a bucket with fresh water, then rinse the winch, slide rails, railing bases, and outboard motor. It’s not a hassle—it takes five minutes at most.However, five years later, the condition of my boat’s hardware is much better than that of the Lagoon next to me, which gets a major annual service.
When it comes to antifouling paint, more expensive doesn’t necessarily mean better
Many people, upon first arriving in the BVI, rush to West Marine to buy the most expensive bucket of antifouling paint, convinced that the pricier option is the better one. In reality, the marine growth on boat hulls in BVI waters is entirely different from that in the United States.
On the U.S. East Coast, barnacles and green algae are the main growths, but here, while barnacles do exist, what’s even more annoying is a type of algae called “horsehair algae.” It’s long and slender, brown in color, resembling a clump of dead human hair. Once it takes hold, it’s extremely difficult to remove even with a scraper. Furthermore, water temperatures in the British Virgin Islands are high, causing marine life to grow two to three times faster than in temperate waters.
The first year, I used International’s Micron 66, a self-polishing antifouling paint that was claimed to last two years. Who would have thought that in less than seven months, a beard-like layer would have grown all over the hull?Later, I spoke with a guy who works on boat repairs in Nanny Cay. He told me that you’d be hard-pressed to find any local BVI charter companies using self-polishing paint; they all use hard-film paints here, such as Pettit Trinidad or Interlux Ultra.Hard-coat paint has a smooth surface that allows water to flow over it very effectively, and it releases antifouling agents over a longer period of time.
The problem is that you can’t just apply hard-film paint to a hull whenever you want. If the boat is hauled out for more than a few days, the paint film will crack, making it unusable once the boat is back in the water—this is a major pitfall of using hard-film paint.Therefore, if you plan to stay in the British Virgin Islands for an extended period, hard-shell paint is a good choice. However, if you’re only here for a single sailing season and plan to haul the boat back to the U.S. after a year, self-polishing paint is a more hassle-free option—after all, sanding hard-shell paint is extremely tedious.
By the way, before applying the primer, you must perform an underwater sanding. Don’t cut corners under any circumstances. Many anchorages in the BVI are only three or four meters deep, where sunlight reaches the seabed directly, causing algae to grow extremely rapidly.If you haven’t thoroughly sanded off the old paint layers, the new paint simply won’t adhere properly. I’ve personally seen a boat where, just two months after the new paint was applied, the hull had become mottled and patchy, as if it had a skin disease. The owner ended up spending three thousand dollars to have the hull sandblasted again.
That “Taste” in the Freshwater System
If this is your first time sailing a catamaran in the tropics, you’re bound to notice one thing: the freshwater on board tastes like a mixture of bleach and rust. Not only that, but after showering, your skin will feel slightly sticky.
This isn’t a problem with the water itself. It’s the tanks, pipes, and pumps.
The freshwater supplied by many marinas in the BVI comes from desalination plants, and its mineral content tends to be on the high side. Combined with the fact that most onboard tanks are made of polyethylene or fiberglass, a biofilm will form on the inner walls over time.Adding chlorine tablets is a viable solution, but as the tablets dissolve, they react with the minerals, producing an even more unpleasant odor.
During the first year, I neglected to maintain the freshwater system at all, which resulted in a slimy, pale yellow mucus that could be scraped from the filter screen at the outlet starting in the second year. I then consulted a British man on the island who had been repairing water systems for twenty years, and he taught me a set of procedures:
1. Disinfect the system once every three months.The formula is one cup of unscented household bleach mixed with 20 liters of fresh water. Pour this mixture into the water tank, then turn on all faucets until you can smell the bleach. Turn them off, let the system sit for 12 hours, and then drain it completely.Finally, refill with fresh water and flush the system twice.
2. Install an activated carbon pre-filter in front of the water tank’s inlet. You can buy these at the marine store in Nanny Cay; they cost about ten to twenty dollars each and last one or two months.
3. After each time you add water, let the water in the tank circulate for about two days before drinking it, as the taste of the fresh water just poured in is the strongest and most pungent.
Once you’ve completed these three steps, while the water may not taste exactly like bottled water, it will at least be drinkable without making you wrinkle your nose, and the taste in the hot water system will also be significantly reduced.
Anchor Windlass—Don’t Let It Eat Sand
In most anchorages throughout the BVI, the seabed consists of seagrass beds and coral sand. Coral sand looks very white and exceptionally beautiful, but once it gets into the anchor winch’s gearbox, it can cause a disaster.
When I first anchored at Cooper Island Beach Club, the seabed conditions were good, so I let out about 25 meters of chain.The next day, when I went to weigh anchor, the windlass ran smoothly at first—until, halfway through the process, I suddenly heard a sharp, metallic grinding sound. I initially thought the chain had jammed, so I leaned over to check, only to find the gaps in the gearbox filled with white sand.
The windlass didn’t break down right then and there, but over the next two months, I could always hear an intermittent “clack-clack-clack” sound whenever I was hauling in the anchor. It wasn’t until I took it apart for inspection that I realized the gears and pawl had been worn down to the point of showing clearly visible grooves.
The solution was actually quite simple:
Before raising the anchor, rinse the chain once with fresh water from above the waterline to wash away most of the sand particles adhering to its surface.
The windlass needs to be lubricated with waterproof grease regularly—at least once every two months. That’s right, it must be done, because the humidity in the BVI causes ordinary grease to emulsify rapidly and become ineffective. Period.
Never touch the chain with your hands while the windlass is running. Don’t laugh—every year, there are cases of people suffering broken fingers due to this very situation.
At the same time, if your windlass is electric, the high temperatures in the BVI are extremely detrimental to the motor’s cooling. When continuously hauling the anchor for more than three minutes, it’s best to pause for a minute before continuing.I know of a person who continuously hauled in a full 50 meters of anchor chain without stopping; eventually, the motor burned out due to overheating, and he was stranded off Anegada for two days before a tugboat arrived.
Canvas and Awnings: UV Rays Are an Invisible Killer
The UV index in the British Virgin Islands is among the highest I’ve ever seen. Data shows that during summer at noon, the UV index here consistently exceeds 11, falling into the category defined as “extreme.”Your eyes can’t detect it, but the sailcloth and bimini top take the brunt of this UV exposure for you.
My original Leopard 45, equipped with a Sunbrella bimini top, looked fine for the first two years.By the third year, the stitching began to break, and soon after, the fabric surface became brittle—it would tear just by pulling on it with your fingers. Even more alarming was that fibers blown into the cockpit by the wind crumbled into a powdery substance, which clung loosely to electronic devices and corroded the screen coatings.
The lesson here is that you should apply a UV-protective spray at least once a year. Buy a bottle of 303 Aerospace Protectant and spray it on the bimini, sail covers, and cushions—this will extend their lifespan by at least a year and a half. Also, don’t let the canvas remain damp for long periods of time.While there are many sunny days in the BVI, occasional downpours do occur. If wet canvas is stowed away before it’s completely dry, mold will grow within 48 hours. Those black spots cannot be washed off—the only solution is to replace the canvas.
In addition, the UV protection strips on the mainsail and headsail should be inspected every two years.I have a friend who, while sailing near Jost Van Dyke, suddenly had the UV strip on his mainsail tear open, causing a tear in the sailcloth that was a full three meters long—he ended up spending $1,800 to replace the sail.
Engine Compartment—The Hottest Spot on Your Boat
Catamarans are equipped with two engines, which is both an advantage and a disadvantage. The advantage is that if one engine fails, you can still slowly make your way back to where you started using the other engine; the disadvantage is that the maintenance workload for two engines doubles, and the high temperatures in the British Virgin Islands accelerate their aging.
While performing maintenance at Nanny Cay on Tortola, I noticed a pattern: every year around May and June, the number of people changing their engine oil spikes dramatically. What’s the reason behind this? It turns out that March and April are the peak season; now that the peak season has ended, everyone finally has ample time to carry out engine maintenance.If you plan to change the oil yourself, never do it at midday, because the temperature inside the engine compartment can reach over 50 degrees. If you crawl in there to work, you’re very likely to suffer from heatstroke in as little as ten minutes.I’ve tried this myself, and I almost couldn’t crawl out of the engine compartment.
Recommendation:
Change the engine oil and oil filter every 250 hours or once a year—whichever comes first.Do not wait until the 500-hour interval specified in the manufacturer’s manual to perform the replacement; under the temperature conditions in the BVI, engine oil degrades much faster than the manufacturer’s specifications indicate.
The seawater pump impeller must be replaced every two years. Rubber exposed to high-temperature seawater can harden and deform; once it cracks, the fragments will clog the cooling water passages. By the time the engine overheating alarm sounds, it’s often already too late.
Every six months, remove the air filter and blow it out. The air in the BVI is heavily laden with salt spray, so a layer of salt will quickly build up on the filter, affecting air intake efficiency. If diesel combustion is incomplete, this can also lead to carbon buildup.
Once, while I was sailing near Norman Island, the port engine suddenly failed to increase its RPM.Upon inspection, I found that the air filter had become clogged with salt spray and dust. I removed it, blew it out with compressed air, and reinstalled it—the engine returned to normal within five minutes.If I hadn’t conducted a self-inspection and discovered the problem on my own, and had to tow the boat back to the dock for repairs, the cost would have started at at least $300.
About the Battery—That Silent Midnight Alarm
What is the worst nightmare when spending the night in the BVI? It’s not things like pirates or rough seas, but rather when, at 3:00 a.m., the inverter suddenly starts beeping “beep-beep-beep” and displays a low-voltage alarm.
The first time it happened, I jumped out of bed and ran barefoot to the control panel, only to see the voltage reading at a mere 11.8V.All the lights on the boat were dim, almost like candlelight. That night, I slept on a stool in the wheelhouse, getting up about once an hour to check the voltage, worried that I wouldn’t even be able to start the engine the next day.
It turned out that the problem wasn’t with the battery itself, but with the charging logic.
During the day in Bridgetown, U.S. Virgin Islands, there is plenty of sunlight, and the solar panels can easily generate enough power.However, the problem is that many people spend the day ashore and don’t return to the boat until evening, when they turn on the air conditioning, refrigerator, ice maker, lights, and navigation systems—causing electricity consumption to spike dramatically.If your batteries are lead-acid or AGM types, their charging acceptance rate is inherently low, and relying solely on the limited daylight hours is simply insufficient to fully charge them. After a few charge cycles, the batteries would end up in a partially discharged state, and their service life would be cut in half.
Later, I switched to lithium iron phosphate (LiFePO4) batteries, which have a higher charging efficiency and can be charged to nearly 100% even with the limited daylight available. Furthermore, the weight was cut in half, and the boat’s speed might have increased by a few tenths of a knot.This, however, requires replacing the controller and inverter with models that support lithium-ion battery charging modes; otherwise, the BMS (Battery Management System) will cut off the output for no apparent reason.
Furthermore, you must never skimp on lithium batteries by purchasing cheap alternatives. There have been cases of lithium battery fires in the BVI. In 2023, a sailboat in St. Thomas was destroyed by a fire caused by thermal runaway in its lithium battery. Do not cut corners on this expense.
Q: How often should antifouling paint be applied to a boat’s hull in the BVI?
It depends on the type of paint used. Hard-coat paint typically lasts 12 to 18 months, while self-polishing paint lasts about 6 to 10 months. If the boat is moored at the dock for long periods without moving, the growth rate will accelerate—with less water flow to wash it away, algae absolutely thrive in this environment.I recommend inspecting the dry hull at least once a year, regardless of whether there is paint remaining.
Q: What should I do if the water still tastes bad after disinfecting the freshwater system?
Add a reverse osmosis water filter—a small, instant-heat model mounted under the kitchen faucet will do. Prices range from about $200 to $400, and it lasts one to two years. It significantly improves the taste, and you’ll recoup the cost in just one month by cutting back on bottled water.
Q: Can I repair a worn-out windlass myself?
Minor issues are usually fine—things like replacing the pawl or adding grease.However, if the gears are already showing signs of wear, I recommend seeking professional repair. There are skilled technicians in both Nanny Cay and Road Reef who can handle this. If you attempt to disassemble and reassemble it yourself without proper expertise, it’s highly likely to develop abnormal noises—or even seize up completely, rendering it inoperable.
Q: What size anchor is suitable for a catamaran in the BVI?
Here’s what I’ve learned from personal experience: You should have at least one 50-pound Delta- or Bruce-style anchor, plus a 35-pound spare anchor, such as a Danforth anchor.In BVI anchorages, the seabed composition varies significantly—sometimes it’s sand, sometimes sea grass, and other times gravel.Catamarans have a larger windage area compared to other boats, so when the wind picks up, they are prone to dragging anchor.I’ve personally experienced damage caused by dragging anchor: while anchored in White Bay, the wind suddenly shifted in the middle of the night, and the anchor dragged 200 meters, nearly causing a collision with another boat.
Q: Can you do your own boat repairs at marinas in the BVI?
Most of them are fine. Nanny Cay has a DIY work area where you can rent tools like hydraulic jacks, angle grinders, and welders. Village Cay also has basic facilities. Just be aware: while you’re working, there might be tourists watching you—it’s not the most comfortable feeling, but you’ll get used to it.
I started writing this while anchored off Anegada. The wind wasn’t too strong at the time, the sun was slowly sinking into the sea, and the boat’s ice maker had just finished a bucket of ice. I poured myself a glass of rum and added a slice of lime.If you also own a catamaran in the BVI, I hope these experiences will help you avoid a few pitfalls.
After all, life in the Caribbean is slow enough as it is. Don’t let boat repairs slow it down even more.