Station Information

Station ID: 1
Latitude: 48.38285
Longitude: -4.494838
Coastline code: 190
Station code: 91
Country: FRANCE
Time span of data: 1807 – 2016
Completeness (%): 90
Frequency Code: 24
MTL Data: 1807-1835
MTL-MSL (mm): -23
Link to ellipsoid: Available
Date of last update: 22 Mar 2017

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR 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: BRST, GUIP, BGBC
Nearby Real Time Stations from VLIZ: bres
Fast Delivery Data from UHSLC station 822: hourly and daily
Research Quality Data from UHSLC station 822: hourly and daily

Station Documentation

Link to RLR information.
=========================== BENCHMARK INFORMATION UPDATE ADDED 12-JUL-93 :
Brest 190/091 RLR(1964) is 12.5m below NGF no1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-JAN-07 :
Older data from Brest are taken from the original volumes of the Publications Scientifiques. In those, 1807-35 are said to be Mean Tide Level and 1846 onwards true Mean Sea Level. At Brest MSL is 23mm above MTL (some estimates say 29 mm), see Woppelmann et al. Ocean Dynamics, 56, 487-497, 2006 (and beware that the equation top of page 495 should read MTL-MSL). (NOTE: 23 and 29 mm values switched to better reflect paper. 26-Jan-2016)
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Jul-2009 :
All monthly means 1937, 1939-1943 replaced and small corrections made to 1917 following the work of Nicolas Pouvreau of the University of La Rochelle.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Aug-2014 :
After investigation the RLR diagram has been revised. Primary benchmark remains the same but the name has been changed to agree with SONEL. Benchmark name is now NO-47. The RLR factor has also been changed when a 2mm discrepancy was found from the original diagram. RLR factor for 1996 onwards is now 2.959.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Sep-2014 :
Using values from the SONEL website the latitude and longitude values have been revised. Additional data for 1857-1860 were included in the SONEL data this has now been added to the database.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 26-Jan-2016 :
A value of MTL-MSL=-23 mm has been applied to the RLR data for the period 1807-1835. This value was taken from the Wöppelmann et al. reference above. Philip Woodworth obtained a similar value of -21 mm in his MTL/MSL manuscript.

Data Authority

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29200 BREST