The first time I crossed Biscay I had a 9.4 metre boat, a wife who had never done a night at sea, and a forecast I had read four times before I believed it. We left Camaret at first light on a Tuesday in late June and dropped the hook in Camarinas, on the Spanish ria coast, on the Friday evening. Three nights, a bit over 300 miles on the log, and a weather window that held exactly as long as the GRIBs said it would. It was, frankly, an anticlimax. Which is the whole point.
Biscay has a reputation that does it no favours. The Atlantic depressions track across it, the continental shelf shelves up under your keel and turns a tired swell into a breaking one, and the pilot charts are honest about how often it blows hard in winter. But the bay does not care about its reputation. It cares about the depression that is or is not crossing it during the three or four days you are out there. Get the window right and a well-found small boat crosses it as a long, mildly tedious downwind passage. Get it wrong and you are in one of the worst seaways in Europe with nowhere to hide.
This is the strategy I would give to anyone taking a boat under 12 metres across for the first time. It is not the only way. It is the cautious way, and after two crossings I have no regrets about being cautious.
What you are actually crossing
The shortest sensible line, Brest or Camaret to A Coruna, is roughly 330 to 360 nautical miles depending on exactly where you start and finish. Most cruising yachts manage that in two and a half to four days. The distance is not the problem. The shape of the seabed is.
For the first 50 or 60 miles south-west of Brittany you are over the continental shelf, where depths sit under 200 metres. Then the bottom falls away into the Biscay Abyssal Plain, which drops past 4,000 metres and reaches roughly 4,700 metres at its deepest. In deep water a big Atlantic swell is long and slow and you ride over it. The danger zone is the shelf edge on the way in and out, where a long ocean swell meets shoaling ground and steepens. It gets nasty fast when the wind has been in the south-west and then backs or veers to the north-west, because you end up with two wave trains crossing on a rapidly shelving bottom. That is the sea state that frightens people, and it is geography, not bad luck.
So the planning question is never just "is the wind light enough." It is "will I be crossing the shelf edge in a building cross sea." Time your departure and your landfall so that the shelf-edge sections happen in settled conditions, even if you accept a bit more breeze in the deep middle.
The three ways across
There is a long-running debate in cruising circles about how to tackle Biscay, and it comes down to three approaches.
The first is the offshore hop: a single passage from Brittany straight to north-west Spain, A Coruna or Camarinas or Gijon. This is what I did. It is the shortest time exposed and it gets the whole thing over with. The catch is that you need a clean three to four day window and the confidence to be a long way from anywhere if it turns.
The second is the coastal crawl down the French side. You work down the Atlantic coast in short legs, La Rochelle, the islands, the Gironde, Arcachon, then jump the bottom corner of the bay from somewhere like Arcachon or the Basque coast across to Spain. The legs between French harbours rarely exceed 20 miles and there is always a refuge to duck into, so it suits a nervous crew or an unreliable forecast. It also turns one passage into a fortnight of cruising, which for many people is the entire reason they own a boat. If you take this route, my La Rochelle visitor guide and the notes on the Ile de Re sailing anchorages cover the best of the middle section.
The third is the compromise that I think most small boats should consider: hop down to Camaret or Audierne, wait there, and then route direct to A Coruna or Gijon. From the bottom of Brittany the crossing is shorter than from Brest, and you have already shaken the boat and crew down before committing to open water. Camaret is more or less a mandatory stop anyway, sitting between the two tidal races, and it is a genuinely lovely harbour to be weather-bound in.
Reading the window
I will not pretend to be a forecaster. But the rules I sail by are simple.
Cross in summer if you possibly can. June and July are the settled months, and offshore gales in those weeks are rare. Spring and autumn crossings happen all the time, and plenty of delivery skippers prefer the steadier downwind weather of September, but the further you are from midsummer the more often the Atlantic throws a depression at you and the shorter your clean windows get.
Look for a slow-moving or stationary high to the west or north-west of Biscay. That is what gives you light to moderate northerlies, exactly what you want for a passage south. Avoid leaving with a front due to cross mid-passage, and avoid the classic trap where the wind is forecast to swing from south-west to north-west, because that is the crossed-sea generator over the shelf.
Pad your window. If the passage will take three days, want four days of decent weather, not three. Forecasts beyond about four days are guesses, so a window that only just covers your passage time is not a window, it is a gamble. I have sat in Camaret for nine days waiting. It was annoying. It was also the correct decision, because the boat that left ahead of us into a marginal forecast got a hammering off Finisterre.
What the boat needs
A 9 to 12 metre cruiser in good order is entirely capable of this passage. The boat is rarely the limiting factor. What matters is that everything works when you cannot stop to fix it.
Self-steering that you trust, wind vane or autopilot, ideally both, because hand-steering two or three days with a short crew destroys people. Reliable navigation lights and an AIS transponder, because you will cross the shipping lanes running in and out of the western approaches and being seen by a ship doing 20 knots at 0300 is not optional. Storm canvas you have actually rigged before, not just owned. A jackstay system and the discipline to clip on at night and in any sea. Enough fuel to motor through the calm patches, because Biscay can also give you 36 hours of glass when the high sits right on top of you.
Before any passage like this I want to know the hull and rig are sound, not assumed sound. If you bought the boat recently and have not had it properly looked over, my notes on hull inspection points when buying a used sailboat are the checks I would not go offshore without.
The crew problem
The honest difficulty of a Biscay crossing is not the sea, it is the people. Two or three nights at sea with two people is hard. Somebody is always tired, watches blur, seasickness flattens at least one crew member for the first 24 hours almost every time, and small irritations grow teeth.
Set a watch system before you leave and stick to it even when it feels unnecessary. I run three hours on, three off at night with whatever overlap the day allows. Plenty of skippers prefer a rolling system, two hours on the helm, two on standby, then four off, which keeps the same person from drawing every cold dawn watch across the passage. Whatever pattern you pick, write it down before you sail so nobody argues about it at 0200. One trick worth borrowing from the rally crews: suspend the watch system for an hour at dinner so everyone eats together and talks, because the thing that grinds people down on a three-day passage is not the work, it is the monotony.
Feed people simple food they can eat one-handed. Have a seasickness plan that does not depend on willpower, which means medication taken before you sail, ideally a tablet the night before, not after someone is already green. Patches behind the ear and wrist pressure bands work for some people too, but the principle is the same: get ahead of it, because once a crew member is being sick they are useless for a day and miserable for two. And agree in advance, on land, what your bail-out plan is, because the moment to decide to turn back is before anyone is frightened, not during.
The shipping and the fishing fleet
Two kinds of traffic will share the bay with you, and they behave very differently. The first is commercial shipping using the western approaches, big, fast and following predictable lines. AIS and a good lookout deal with that, and a ship will usually answer a call on channel 16 if you need to confirm she has seen you. The second is the fishing fleet, and that is the one that catches cruisers out. Trawlers work erratic courses, tow gear that extends well behind and to the side of the boat, and do not always keep the watch you would hope. At night a cluster of working lights with no obvious pattern is almost always a fishing boat, and the safe assumption is that they are concentrating on the catch, not on you. Give them a wide berth, do not try to cut between a pair that might be pair-trawling with a net strung between them, and keep your best crew on watch through the shelf-edge zone where the fishing concentrates.
There is also a tactical note worth knowing. In heavy weather, crews report a cleaner sea state by staying west of about 7 degrees of longitude, out over the deeper water and away from the worst of the shelf effects. You are not committing to a mid-ocean detour, but if the forecast is marginal it is a reason to favour a more westerly line on the way down rather than cutting the corner across the shoaling ground.
Landfall
A Coruna is the classic Biscay landfall and a fine one, a real working and cruising port with marina space, but check ahead in high summer because the rias fill up. Camarinas, where we made our first landfall, is quieter and beautiful and a soft place to arrive exhausted. Gijon, further east, suits boats coming from the bottom corner of the bay rather than straight down from Brittany.
Whichever you choose, do not push a tired crew into a tricky entrance at night after three days at sea. If the timing is wrong, heave to or slow down offshore and go in at dawn. Every bad arrival story I have heard ended with someone hurrying a landfall they should have waited out.
That is really the whole philosophy. Biscay rewards patience and punishes haste. Pick the window, prepare the boat, look after the crew, and the bay that everyone warns you about turns into three quiet nights and a long story you get to tell afterwards. If you are working your way down the French coast first rather than jumping straight across, the Ile d'Oleron and the Pertuis and the Arcachon basin entries are where the local pilotage gets interesting, and where the small-boat caution that gets you across Biscay pays off all over again.
