1941-1942 data supplied by B.O.D.C.
1959-1962 data supplied by the National Geographical Institute, France
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Le Havre            190/051 RLR(1977) is 12.7m below BM NGFNPC17
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Oct-1994
1991-93 problems with gauge operation, numerous gaps
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Mar-2012
Primary benchmark is now IGN N.CP-15 9.767m above Zero Hydrographique.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Sep-2014
Using values from the SONEL website the latitude and longitude for Le Havre has been revised. The data downloaded from SONEL contained a number of additional data points particularly for the 1980's. Because of this the whole dataset has been re-loaded.