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.
Plum Island is now an Historic station. Last data received was that for 1968. The original RLR diagram referred to BM 4 3.280m relative to gauge datum. At some stage this was obviously superseded by BM TIDAL 4 STA II 24 4.234m relative to gauge datum. There is now no mention of BM 1 on the NOAA website.