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Ocean, surf and diving

8 articles

Surfing, sailing, land sailing and snorkeling: enjoying the coast and the ocean with the right habits.

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Wooden lifeguard post on a sandy beach, with a yellow flag on the mast and the French flag, under a blue sky

OceanRules and regulations

French Beach Flags and What They Mean

Since March 1, 2022, the mast of supervised French beaches has flown rectangular green, yellow or red flags set by decree: yellow took the place of the old orange pennant. Purple is not in the decree. Two red-and-yellow flags mark the supervised zone, and everywhere else you swim at your own risk.

Portrait of Chloé SchmidtChloé Schmidt··6 min

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A woman in a yellow swim cap and black swimsuit wades knee-deep into a calm ocean at dawn, a yellow tow float trailing behind her on a pebble beachOcean

Cold Water Swimming: The Risks to Know First

Cold water swimming for beginners: why the first minutes are the danger, why no safe duration is published, who should see a doctor, and what research shows.

Portrait of Arnaud CoudercArnaud Couderc··8 min

Shaping bay with a raw white foam surfboard blank on a wooden workbench, a yellow tape measure and a metal caliper beside itOcean

Surfboard Volume Calculator for Your Weight

Find your surfboard volume in liters from your weight and skill level: the tool, Firewire’s chart, Lost’s ranges, and where each one stops being reliable.

Portrait of Julien de JurquetJulien de Jurquet··7 min

Long, regular, parallel lines of swell rolling in from the open ocean toward a rocky coast, seen from the top of a cliff in low lightOcean

How to Read a Swell Forecast, Number by Number

Significant wave height, period, direction, swell vs. wind waves, offshore wind: what the numbers in a swell forecast mean, source by source.

Portrait of Arnaud CoudercArnaud Couderc··17 min

Instructor seen from behind, standing in shallow water and facing the ocean, with three students lying on foam boards in the whitewater near shoreOcean

Learning to Surf, From School to First Wave

Surf schools, certified instructors, foam boards, right-of-way rules, beach flags, and rip currents: how to start surfing safely, country by country.

Portrait of Arnaud CoudercArnaud Couderc··16 min

An open-water swimmer in a black fullsuit and orange swim cap, mid freestyle stroke in a gray-green ocean, an orange swim buoy trailing behindOcean

Wetsuit Thickness: 3/2, 4/3, or 5/4?

3/2, 4/3, 5/4: which wetsuit thickness for which water temperature, when to add booties, gloves, and a hood, and how warm the water gets along US coasts.

Portrait of Nolwenn BastideNolwenn Bastide··8 min

A woman surfer seen from behind walking along the water's edge on a sandy beach, a foam beginner board under her arm, in soft morning lightOcean

Surfboard Volume: The Formula and Charts

How to calculate surfboard volume: your weight times a coefficient for your skill level, the charts from Firewire and Lost, and how shape changes the math.

Portrait of Nolwenn BastideNolwenn Bastide··8 min

A wide sandy tidal flat at low tide at sunrise, with tide pools and sand ripples, the ocean far off, and seaweed-covered rocks in the foregroundOcean

Understanding the Rise and Fall of the Tide

High and low tide, tidal range, France’s coefficient from 20 to 120, and the rule of twelfths with an example: how tides work and where to find tide times.

Portrait of Nolwenn BastideNolwenn Bastide··8 min