Station Information

Station ID: 471
Latitude: 50.727501
Longitude: 1.57746
Coastline code: 190
Station code: 21
Country: FRANCE
Time span of RLR data: 1941 – 2023
RLR completeness (%): 44
Time span of metric data: 1941 – 2023
Metric completeness (%): 44
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: EQH2, EQHE
Nearby Real Time Stations from VLIZ: boul2, boul

Station Documentation

Link to RLR information.

Documentation - date unknown


Documentation added 1991-06-11

Boulogne 190/021 RLR(1976) is 13.0m below RepereA(1976)

Documentation added 1993-07-22

readings discontinued october 1991

Documentation added 2010-05-17

There is no data for 2008 and very little data for 2009. The data for 2009 has been flagged as suspect as it looks too low.

Documentation added 2011-02-01

With updated information available from both the SHOM and SONEL websites the RLR diagram for Boulogne has been re-drawn. Primary benchmark is now N.BC - 15 10.679m above TGZ (Zero Hydrographic). IGN 69 is 4.388m above TGZ. As the datum remains the same the RLR factor remains 2.090m.

Documentation added 2014-09-29

A number of additinal data values for 1987 have been added to the dataset. To incorporate these the whole dataset has been reloaded.

Data Authority

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29200 BREST