339/2026
French Navy hydrographic survey around Roches-Douvres (Casquets)
No longer in forceReceived 05 Sept 2026, 12:59 UTCArchived 17 Oct 2026, 00:04 UTC
Warning text
Positions open on the mapLang
Area: CASQUETS
Locality: ROCHES DOUVRES
Valid from 06 Sep 2026 to 16 Oct 2026
A French Navy vessel will be conducting a hydrographic survey from September 6th, 2026, to October 16th, 2026, in the Roches-Douvres Plateau area. Mariners are asked not to interfere with this work and to keep a distance of at least 400 meters from the vessel. Instruments are going to be towed at 180 meters of the boat.
area bounded by:
49-02.62N 002-47.46W
49-07.00N 002-45.51W
49-08.27N 002-44.25W
49-08.83N 002-41.94W
48-59.71N 002-39.65W
area bounded by:
48-59.80N 002-55.01W
49-04.81N 002-53.07W
49-11.53N 003-14.40W
49-04.61N 003-13.03W
Location map
Open in the full mapAnalysis
No longer in forceA French Navy vessel will conduct a hydrographic survey on the Roches-Douvres Plateau (Casquets) area. Activity runs from 06 Sep 2026 to 16 Oct 2026. Towed survey instruments will be 180 metres astern of the vessel and mariners are requested to keep at least 400 metres distance and not to interfere. The survey area is given by two bounded polygons in the warning.
Do not interfere with the survey vessel; keep clear by at least 400 metres and navigate with caution in the area.
- Type
- Survey operations · severity moderate
- Feed
- Survey operationsAll warnings of this kind on the map, or as an API feed.
- Location
- Casquets - Roches-Douvres Plateau
- Validity
- From 06 Sept 2026, 00:00 UTC
Until 16 Oct 2026, 23:59 UTCValid from 06 Sep 2026 to 16 Oct 2026 - Activity periods
- 06 Sept 2026, 00:00 UTC - 16 Oct 2026, 23:59 UTC (Survey period as stated: 06 Sep 2026 to 16 Oct 2026)
- Hazards
- hydrographic survey vessel, towed survey instruments
- Keep clear
- 0.216 NMkeep a distance of at least 400 meters from the vessel
Vessels involved
- French Navy vessel · survey vessel
Coast stations for this area
- RCCMRCC JobourgFrance52 NM from the area
- RCCMRCC FalmouthUnited KingdomMMSI 00232001471 NM from the area
- RCCMRCC EtelFranceMMSI 00227500085 NM from the area
- DSCDSC Station Roches DouvresMRCC JobourgFranceMMSI 002275200VHF 25range 25 NM4 NM from the area
- DSCDSC Station BodicMRCC CorsenFranceMMSI 002275300VHF 25range 25 NM19 NM from the area
- DSCDSC Station GranvilleMRCC JobourgFranceMMSI 002275200VHF 26range 26 NM48 NM from the area
- DSCDSC Station Batz IslandMRCC CorsenFranceMMSI 002275300VHF 27range 27 NM51 NM from the area
- DSCDSC Station JobourgMRCC JobourgFranceMMSI 002275200VHF 42range 42 NM52 NM from the area
Worked out automatically from the warning text on 29 Sept 2026, 21:37 UTC. It can be wrong: the official warning text is the authority.