Station Information

Station ID: 457
Latitude: 47.27
Longitude: -2.2
Coastline code: 190
Station code: 111
Country: FRANCE
Time span of data: 1941 – 2023
Completeness (%): 48
Link to ellipsoid: Available
Date of last update: 30 Jan 2024

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: STNZ, STNA
Nearby Real Time Stations from VLIZ: sain2, sain

Station Documentation

Link to RLR information.

Documentation - date unknown


Documentation added 1991-06-11

St Nazaire 190/111 RLR(1974) is 11.9m below BM NGFN.45

Documentation added 1993-07-12

St Nazaire 190/111 RLR(1974) is 11.9m below BM NGFN.45

Documentation added 2010-08-25

New primary benchmark IGN "NGF" OKS 69 was installed in 1990 8.852m above the then Chart Datum. In 1996 the value for Chart Datum was lowered by 0.4m. So new benchmark IGN
"NGF" OKS 69 now 9.252m above the new Chart Datum.
RLR factor for data 1941-1996 is 3.905m. RLR factor for data 1996 onwards is
3.505m. RLR (1974) is 12.757m below TGBM IGN "NGF" OKS 69

Documentation added 2014-10-02

Using data from SONEL the latitude and longitude for St. Nazaire has been updated. The data downloaded from SONEL contained a number of additional and revised data points particularly around the early 2000's. Because of this the whole dataset was reloaded onto the database. This revised dataset had been adjusted to the same datum. With the revision to the dataset data values for 1943 onwards now have the RLR factor 3.505m.

Data Authority

13 rue de Chatelier
29200 BREST