We were halfway up the Trieux river, motoring against a making flood, when the engine note stayed steady but the boat stopped responding to the throttle. Revs there, drive gone. In open water that is a nuisance. In a buoyed channel in north Brittany, with a 2-knot stream pushing us towards the green side and a falling rock ledge waiting under it, it was a problem that needed solving in minutes, not hours.
That afternoon taught me more about tidal seamanship than a season of fair-weather sailing. A drive failure in still water is one thing. The same failure in a tideway is a different beast, because the water is doing the navigating for you and it does not care which way you wanted to go.
Why a channel changes everything
In open water, lose drive and you drift slowly while you think. In a channel the tidal stream can run at 2, 3, sometimes 4 knots or more on a north Brittany spring, and it carries you bodily towards whatever the channel is steering you between. The margins that felt comfortable at 5 knots of boatspeed vanish when boatspeed is zero and the ground is moving past at the speed of the tide.
So the first thing to fix in your head is time. You probably have minutes before the set puts you in trouble, not the leisurely hour you would have offshore. Act on that timescale.
First sixty seconds: read the failure
Drive loss splits into two families, and they call for different responses.
Gearbox or transmission side: engine runs, revs respond, but no thrust. You shift to ahead or astern and nothing happens, or there is a clunk and a slip. Cable linkage, gearbox oil, a failed coupling, or the box itself.
Prop side: engine runs, you may feel a vibration or a sudden judder, and thrust drops or dies. The classic in Brittany is a rope or a fishing pot warp round the shaft, which I cover in fouling fishing pot brittany, but it can also be a dropped or spun prop, or a bent blade after a touch on the bottom.
You do not need a full diagnosis in the first minute. You need to know whether you have any usable drive at all, because that decides everything that follows. Try ahead, try astern, gently. If you have even a knot of thrust in either direction, you have options.
Buy room before you fix anything
With the stream working against you, the priority is to stop being set towards danger. In rough order:
- Get the bow or stern pointing where you need, using whatever drive you have, even briefly.
- If you have sails up or can get a scrap of headsail or main out fast, do it. A channel often gives you enough wind angle to claw across to the safe side or hold ground.
- Anchor. This is the move most crews leave too late. In a channel with a known bottom and water you can reach, dropping the hook stops the boat dead relative to the ground and turns a fast emergency into a slow problem you can work calmly. Have it ready to let go the moment you lose drive in confined water, every time, in any tideway.
An anchor down in 6 metres while you sort a fouled prop is worth more than any clever bit of engine work. It removes the clock.
A word on where you anchor. In a narrow channel you may not want to block it, and you may not have much water to either side. Aim for the edge of the dredged channel rather than the middle, drop enough scope to hold against the stream (in a 3-knot tide that means more chain than you would put out at a calm lunch stop), and once you are holding, get a fix and check your transits to be sure you are not dragging. A boat that drags in a tideway is back in the same trouble it just escaped, only now with an anchor down to complicate the recovery.
Working the problem at anchor or hove-to
Once you are not being carried onto anything, diagnose properly.
For a suspected fouled prop, look over the stern. A pot warp is often visible. Do not put the engine in gear with a line round the shaft; you can make it far worse or shear the cutless bearing. If you can reach it and conditions are safe, clearing it in the water is sometimes possible, but cold Brittany water and a running tide make that a serious decision, not a casual swim. Often the right answer is to stay put and get a tow.
For a gearbox or linkage fault, check the obvious first: gear cable still attached at both ends, oil level, anything jammed at the lever. A dropped cable is a roadside fix; a failed box is not.
If you cannot restore drive, you now choose between waiting for slack water to make the situation easier, sailing clear if the channel allows, or calling for help.
When to call, and who answers
The trigger for a call is simple. If you are anchored safely and just need a tow when convenient, that is a low-key request you can sometimes arrange boat-to-boat. If you are still being set towards danger and cannot stop it, that is urgent, and you should not wait to see if it gets worse.
All sea calls in France route through CROSS, the rescue coordination network reachable on VHF channel 16 or the phone number 196. They decide who comes: the SNSM volunteer lifeboat, a commercial tow, or a nearby boat. Use Pan Pan for a serious-but-not-life-threatening situation like a drive failure near hazards, and Mayday only if life is in danger. The exact wording is in the french distress safety call procedure, and the structure of the CROSS network is explained in cross french coastguard vhf.
The tow, and the bill
If the SNSM tows you, remember that rescuing people is free but towing the boat is chargeable: roughly 340 euros per hour under 7 metres, 600 euros per hour for 7 to 12 metres, and 690 euros per hour over 12 metres, with the clock typically running from the moment the lifeboat leaves its berth. In a remote north Brittany estuary the nearest station may be a fair way off, so the bill builds before help even arrives. How that works, and the salvage trap if you take a line from a passing fishing boat instead, is set out in towing at sea france and the cost detail in snsm lifeboat cost.
Insurance usually covers the tow if the policy is written to. Check the assistance clause before you leave home, especially on a foreign-flagged boat where cover for France can be thin.
Prevent the worst of it
You cannot stop a gearbox failing at the wrong moment, but you can stack the odds.
- Time your channel passages around the tidal gates so you are working with the stream, not punching it. The Brittany gates are unforgiving, and I keep notes on the worst of them in engine failure raz de sein.
- Keep the anchor ready to let go in any confined water. Not stowed, ready.
- Carry a serrated knife and a way to reach the prop, and know your gearbox oil and cable layout before you need them.
- Watch for floating pot markers and net dahns, the usual culprits, and slow down through fishing grounds.
The Trieux ended well. We anchored within a boat length of the channel edge, found a frayed pot warp wrapped twice round the shaft, and waited for slack and a friendly local launch rather than a metered tow. The lesson stuck: in a tideway, the anchor is your engine when the engine quits.
