=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Mar-1993
Probably several datum shifts in the RLR record obscured by the seasonal cycle.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Yantai              610/036 RLR(1972) is 11.0m below BM(1968.2)
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 19-Oct-1993
datum queries for 1956/57 and 1966/67 noted, followed up with authority. Yantai is an historic station last data 1994