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.
Using NOAA data the RLR diagram was updated. Primary benchmark is now 8510560 J 1977 3.618m above gauge datum. Previous PSMSL benchmark relates to NO 9 1947 BM9 for 1947-1982 the value was 3.453m above TGZ. For 1983 onwards value given as 3.448m on the NOAA website.