=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 19-Oct-1993 Lianyungang 610/033 RLR(1990) is 12.5m below BM =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 18-Jan-2012 Using data values from the latest UHSLC JASL cd data values for 1995-1997 have been added to the 'METRIC' dataset. Before adding the 3 years of data where the data values overlapped a difference of 5-10mm was evident.