Gunner's Quoin — is a wild, rocky island of approximately 66 hectares that rises from the ocean off the coast of Cape Unhappy, the northernmost village in Mauritius. Its characteristic silhouette, with its steep cliffs and low vegetation clinging to the rock, is reminiscent from afar of the shape of a rifle stock — hence its name.

He is not it's not possible to land there. Coin de Mire is a protected nature reserve, a sanctuary for numerous seabird species that nest there, sheltered from any human presence—tropicbirds, red-footed boobies, and frigatebirds are regularly observed from the boat. The catamaran gets close enough to admire its imposing cliffs and observe the famous "Trou Madame," a natural arch carved into the rock by the waves. It's one of the highlights of the sailing trip, and one of the most photographed of the excursion.

The island also has a historical dimension: in the 19th century, the British installed a battery of cannons there to control the northern entrance to the Mauritian lagoon, making Coin de Mire a strategic as well as a natural point.

Flat Island is a low-lying, elongated island surrounded by a shallow, turquoise lagoon. Unlike Coin de Mire, it's possible to land there, and some excursions stop for swimming or snorkeling. Its name comes from its topography: unlike the neighboring volcanic islands, the terrain is very flat.

The island is home to a historic lighthouse of the 19th centuryStill in operation today, it was built to guide ships into the northern lagoon of Mauritius. Flat Island also played a significant historical role: during the colonial era, ships entering Mauritius had to stop there for quarantine to prevent the spread of diseases like cholera and yellow fever. This past gives it a picturesque and historically rich character, which isn't necessarily apparent when viewed from the sea.

The surrounding seabed is renowned for its richness: colorful corals, tropical fish, and excellent visibility make it a prime spot for snorkeling highly appreciated.

Depending on the operators and the conditions of the day, the main stop is sometimes at Flat island, sometimes at Gabriel Island — the two being located about 750 meters from each other.

Beneath the surface, the islet reveals a remarkably well-preserved marine ecosystem. The shallow waters of the lagoon offer ideal snorkeling conditions: butterflyfish, parrotfish, giant clams, groupers, and sometimes sea turtles complete this underwater scene. Visibility is generally very good. The islet also hosts several species of nesting seabirds, and a walk around the island takes about thirty minutes. To learn more, consult our page dedicated to gabriel Island.

The day begins early, usually around 8:30 or 9:00, with boarding at the departure dock. The catamaran first heads towards coin de Mire: approximately 45 Minutes to An hour's sail On the open sea, sometimes choppy depending on the conditions. the crew Sails along the island's cliffs, allowing passengers to admire the trou madame (Madame's hole).

The boat then heads towards Gabriel Island or Flat Island for the main stop, which usually lasts two to three hours. This is the time to swim, snorkel, stroll on the beach, or simply relax. Snorkeling equipment (mask, snorkel, fins) is usually provided by the operators.

THE lunch is served on board, usually at the time of return or just before: curry, grilled meats, rice, vegetables and tropical fruits make up a convivial meal, often accompanied by local drinks included in the package.

The return to port usually takes place between 3:00 p.m. and 4:30 p.m. Depending on the season and luck, the catamaran sometimes encounters dolphins or whales on the return voyage — a surprise that leaves a lasting impression.

The vast majority of excursions to the 3 northern islands depart from the marina of Grand BayIt is very easy to find an operator on site, or to book in advance through your accommodation. Some departures also take place from other points on the north coast, particularly near Cap Malheureux.

Two types of boats are Offered:

• The classic catamaran The most popular and economical option. Comfortable and spacious, it accommodates a group of tourists in a relaxed atmosphere. It's the recommended choice for the majority of travelers.
• The speedboat More expensive and much more uncomfortable in rough seas. Only book this option if sea conditions are excellent and comfort is not a priority.

Some operators offer so-called "premium" catamarans at a higher price. In practice, the difference sometimes translates into a smaller group, a private sundeck, or an open bar—perks that may justify the extra cost depending on your priorities. Otherwise, a well-maintained standard catamaran offers a very similar experience: it's better to compare what's included in the price rather than relying solely on the name. Find all the boat excursions available in Mauritius on our website.

Prices vary depending on the provider and the plan. As a guide, expect to pay between 30 and 50 Euros per person for a classic catamaran excursion including lunch and drinks. Prices may be higher during peak season or for premium packages.

Before booking, always check what is included:

• Lunch on board (usually included in standard packages)
• Drinks, alcoholic or not
• Snorkeling equipment (mask, snorkel, fins)
• Life jackets
• Transfer from your accommodation (sometimes a paid option)

Take the time to compare several operators: prices and services can vary significantly for an apparently identical excursion.

• Beach shoes Pack water shoes in your bag. The shoes you wear when boarding must remain on the dock — no closed shoes are allowed on board.
• Biodegradable sunscreen A full day at sea exposes you to significant sun exposure. Opt for a waterproof and biodegradable sunscreen—some operators and marine protected areas recommend or require it to protect coral reefs. Add a hat and sunglasses.
• Seasickness The open sea crossing can be rough depending on the conditions. If you are prone to seasickness, take appropriate medication before boarding.
• Waterproof camera : the snorkeling conditions at Gabriel Island are worth immortalizing.
• Towel and change of clothes : you will get out of the water several times during the day.
• Respect for nature Gabriel Island and Flat Island are protected nature reserves. Do not take anything—no shells, no coral, no sand. This is what allows these sites to remain so pristine.

This excursion is possible year-round, but conditions vary. may-October period The southern winter is generally the most pleasant time For sailing: calmer seas, clear skies, and mild Temperatures. the period From november to april (southern summer) is warmer and more humid, with a greater risk of swells and cloud cover, but excursions remain very accessible.

If you are travelling between july and octoberYou'll also benefit from an added advantage: it's humpback whale season in Mauritian waters. These cetaceans frequent the north of the island during this period, and it's not uncommon to spot them while sailing. All the more reason to choose these months for this excursion.

Whatever the season, choose a day with good weather and relatively calm seas. Don't hesitate to check the marine weather forecast the day before. For more advice on preparing for your trip, consult our complete guide to organize your trip to Mauritius.

Overall, this excursion is well-suited for families. The stops at Gabriel Island or Flat Island are in shallow, calm waters, ideal for young swimmers. Life jackets are available on board. However, for very young children or those sensitive to movement, the open sea crossing should be taken into consideration: depending on the conditions, the swell can be quite significant on the journey to Coin de Mire.

If you'd like to explore other boat trips from the east coast, also check out the catamaran excursion to île aux Cerfs, another unmissable day in Mauritius.

Can we land at Coin de Mire?
No. Coin de Mire is a protected nature reserve: all landings are prohibited. The catamaran approaches to admire the cliffs and the natural arch known as "trou madame", but no one can set foot on land.

Is snorkeling suitable for beginners?
Yes. The stops at Gabriel Island and Flat Island are in shallow and generally calm waters, well-suited for beginners and children. Equipment (mask, snorkel, fins) is usually provided by the operator.

Is it better to book in advance or on site?
Both options are possible. During peak season (July-August, December-January), booking in advance avoids missing out on the most popular boats. During the off-season, you can easily find an operator by going directly to the port of Grand Baie in the morning.

Is the excursion cancelled in case of bad Weather?
Yes, tour operators cancel or postpone excursions when sea conditions are dangerous. If they cancel, a refund or rescheduling is usually offered. Check the cancellation policy at the time of booking.

Can we see dolphins or whales?
It's possible, but not guaranteed. Dolphins are sometimes spotted while sailing. Humpback whales frequent Mauritian waters from July to October—so this is the best time to hope to see them.

What is the total duration of the Excursion?
Allow a full day: departure between 8:30 and 9:00, return usually between 15:00 and 16:30 depending on the operators and conditions.