There are places where an engine failure is an inconvenience and places where it is a genuine emergency, and the Raz de Sein, the tidal gate off the Pointe du Raz at the western tip of Brittany, sits firmly in the second category. The stream runs up to about 6 knots on a big spring, with local accounts of 9 knots over the worst of it, the bottom is foul with rock, and the swell that builds over the overfalls when wind opposes tide is the stuff of Yachting Monthly horror videos. So when our raw-water alarm went off mid-channel one August afternoon, with the ebb under us and the Plateau de la Vieille lighthouse fine on the bow, I learned a few things very quickly.
This is not a how-to-fix-your-engine piece. It is about what you actually do in the cockpit in the minutes after the engine stops, in a place where you cannot simply drift and think.
First: keep sailing, or start sailing
The single most useful thing about the Raz is also the thing that frightens people: the tide. If you have timed your passage properly you are going through at or near slack water, and you have the stream on your side for the run that follows. The classic plan, getting the timing right at the tidal gate, is to take the Raz at slack and let the new stream carry you clear, and that same plan is your lifeline when the engine quits. The water is moving you in the direction you want to go.
So before you do anything about the engine, sort the sails. If you were motoring with sails furled, get the headsail out and the main up to whatever the conditions allow. The Raz de Sein is navigable under sail, sailors did it for centuries before engines, and a yacht making 4 or 5 knots through the water with the ebb under her is in control. A yacht wallowing with no drive is at the mercy of the overfalls. Steerage way is everything here, because the rocks are close and the eddies will spin a boat that has no way on.
If you are not sure your sailing skills are up to threading the channel, that is a strong argument for never entering the Raz under engine alone in the first place. The detailed pilotage, transits, and timing for the whole stretch are set out in the guide to the Chenal du Four and Raz de Sein passage, and reading it before you go is cheap insurance.
Use the gate, do not fight it
Here is the counterintuitive part. Your instinct with a dead engine near rocks is to stop, to anchor, to take control by force. In the Raz that is usually wrong. The water is deep in the fairway, 40 metres and more in places, far too deep to anchor usefully, and the stream is too strong to hold against. The right move is to keep going, let the tide sweep you through and out the far side into more open water, and only then think about stopping.
Going through northbound on the flood, the stream carries you up towards the Chaussee de Sein and the approaches to Audierne and Douarnenez. Southbound on the ebb, it takes you down towards the Penmarch peninsula. Either way, the deepest, safest water is along the marked channel, so your job under sail is simply to hold the transit and let the gate do its work. Once you are clear of the worst overfalls, perhaps a couple of miles beyond the narrows, the world calms down and you have room to heave to, sort the engine, or set up a tow.
Working the problem once you have sea room
Engine failures in this part of the world cluster around a few causes, and two are worth checking the second you have a moment. The first is a blocked raw-water intake, which screams its presence through the overheat alarm and a lack of cooling water out of the exhaust. The second is a fouled propeller, because the waters off western Brittany are thick with fishing gear and a wrapped pot line will stop a shaft dead. If you suspect the prop, do not send anyone over the side in the Raz itself, with 6-knot streams that is a recipe for a second emergency. Wait for slack and shelter. The whole grim business of a fouled prop in Brittany is its own subject, with a method for clearing it safely.
If it is cooling, check the seacock and strainer for weed and the impeller. If it is fuel, you may have stirred up dirt and blocked a filter. None of this is work to attempt while you are still being thrown around, which is exactly why getting clear of the gate first matters so much.
Time it so failure is survivable
The reason the Raz catches people out is bad timing more than bad luck. Slack water at the Raz de Sein falls roughly at HW Brest minus 2 and HW Brest plus 4, and the window of genuinely slack water is short, around 30 minutes at the start of the flood and as little as 10 minutes at the turn to the ebb. Boats that arrive an hour either side of slack meet the full strength of the stream, and that is when a dead engine becomes dangerous rather than merely annoying. A common and sensible strategy is to take the Chenal du Four with the last of the south-going ebb, cross the Iroise against the weak streams in the middle, and arrive at the Raz to catch the new ebb southbound. Plan it that way and even an engine failure leaves you drifting in the right direction, towards open water, not back into the overfalls.
The other timing rule is wind against tide. The overfalls in the Raz turn vicious when a fresh breeze opposes the stream, and the safe practice is simply not to attempt the passage when wind and a strong tide are set against each other. If you respect that, an engine failure happens in manageable seas. If you ignore it, you are trying to make sail in breaking water with rocks to leeward, and that is a different and far worse problem.
When to call, and who answers
If you cannot restart and you are being set towards danger, you call. This stretch of coast is the responsibility of CROSS Corsen, near Brest, which covers the western Channel and the approaches from Mont-Saint-Michel down to the Pointe de Penmarch, including the Ouessant traffic scheme. You reach them on VHF channel 16, or by dialling 196 from a mobile, free, day or night.
The grade of call depends on the threat to life. If you are sailing under control and simply want assistance arranged because you have no engine, that is a Pan-Pan, urgency, not a Mayday. If you are being driven onto the rocks and your safety is in immediate doubt, it is a Mayday. Getting the level right matters, because it tells CROSS how hard to push the response. The exact words, in English and the French equivalents, are in the breakdown of the French distress and safety call procedure, and the structure of CROSS itself, the stations and what they each cover, is explained in the overview of the French coastguard and CROSS.
The tow, and the bill
If it comes to a tow, the boat that arrives is likely to be an SNSM lifeboat, the French volunteer service that does the job the RNLI does in Britain. Worth knowing in advance: saving life is free, but towing an undamaged boat home is not. SNSM tow rates run from roughly 90 euros for a small job to around 300 to 395 euros an hour for an all-weather boat, charged by size and distance. In a place like the Raz, when life genuinely is at risk you do not hesitate, that is what the service exists for. But it is one more reason to sail clear under your own canvas first whenever you safely can.
The lesson the Raz teaches
Our alarm turned out to be a plastic bag over the intake, cleared in fifteen minutes once we were two miles south in flat water off Audierne, sailing comfortably the whole time. What saved the afternoon was not mechanical skill, it was the decision in the first thirty seconds to make sail and keep using the tide rather than stopping. The Raz de Sein rewards the boat that keeps moving and punishes the one that tries to fight the stream. Time your passage for slack, carry enough sail to keep way on, know which CROSS station is listening, and an engine failure here becomes a manageable problem rather than a wreck on the Pointe du Raz.
