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Almanac

Marinas

Events

Navigation

RAZ DE SEIN

Charts


Admiralty: 1432, 3345, 2694
Imray: C35, C36, C37
 

Hazards


Numerous rocks and shoals - thankfully well marked!
Strong tidal races and overfalls

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SouthBritanny1
 

Best Departure Points


Southbound:
Chenal du Four, Rade de Brest, Baie de Douarnenez, Camaret, Morgat.
Northbound:
Audierne
 

Best Departure Tides


Southbound:
Those continuing from the Chenal du Four towards the Raz need to time their arrival at Pte St. Mathieu no later than LW slack. This will give you ample time to negotiate the 15Nm passage across the Iroise before the ebb starts at the Raz. The tides across Iroise are much weaker than the passages at either end and the max spring rates are less than a knot and set across the yacht's track rather than against it. Having cleared the Chenal du Four on a fair tide, its quite possible to arrive too early for the Raz which should be negotiated at slackwater - in this case HW slack (HW Brest). Temporary anchorage can be found in Baie des Trepasses or I'le de Sein. Those coming down from the Four are likely to veer to the west and round the Vandee WCM which avoids the reefs and wrecks extending from the Crozon Peninsula. Those come from the Rade de Brest area are more than likely to cut inside the reefs passing between Pte de Toulinquet and the off lying reefs.

Northbound:
Audierne is 10Nm from the Raz, and therefore if making for any of the harbours in the Iroise then a passage through the Raz at LW slack (LW Brest) would provide a fair tide for the onward leg. If making for the Chenal du Four then you'd need to be away from the Harbour limits of Audierne as soon as the second half of the flood starts in order to arrive at the Raz over the HW slack - this should provide ample passage to make Pte de St. Mattheu at LW slack in time for the next north going flood.

 

Best Departure Times


The passage is navigable both at day and night. However, one of the many dangers of a night passage is the sheer number of lights which will require to be identified and therefore demand absolute concentration - and many buoys are unlit which are hazards in themselves. A night passage will also not make it possible to judge the smoothest water.
Neaps in calm weather, or wind with tide conditions are ideal and should offer little trouble. Avoid wind against tide at all costs.
 

Course to Steer


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RazdeSein

When approaching the Raz from the north, make for a point midway between Tevennec and Jaune du Raz and then head towards La Vielle. As soon as you're abeam Pte du Raz, make for the tall yellow and black tower of La Chat on a course 220訊 for 1Nm until Tevennec bears 330訊 where you alter course to 148訊, keeping clear of La Plate by 0.5Nm and being mindful of the Kornag Bras shallows to the east of La Chat. As soon as La Vielle bears 000訊 you can turn eastwards keeping a good 1Nm off the coast. The smoothest water through the Raz is generally found on the I'le de Sein side. The overfalls generally lie abeam of La Plate and stretch northwards towards Tevennec for some way. Some light relief can be found towards the middle of Baie des Trepasses, however there're dangers which could lie in your path on the north side of the bay. A clearing line 160訊 on the Semaphore on Pte du Raz will clear these dangers.

Razplan1


 

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