Add 5.588m to data values up to 1965 to refer to RLR (1975)
Add 5.604m to data values 1966-1971 to ferer to RLR (1975)
Add 5.608m to data values 1972-1975 to refer to RLR (1975)
Add 5.612m to data values 1976-1981 to refer to RLR (1975)
Add 5.619m to data values 1982-1991 to refer to RLR (1975)
Add 5.626m to data values 1992 onwards to refer to RLR (1975)
RLR (1975) is 9.873m below BM Yokosuka (i)
