station at Biological station discontinued and replaced by station at Esso Pier
Documentation added 2011-12-08
BM1 was an old mark that no longer exists. Benchmark 5535 H 1978 2.445m above station datum was the Primary benchmark for the Bermuda Biological Station gauge. Benchmark 5540 A 1979 is the Primary benchmark for the Esso Pier tide gauge. From the NOAA website is the following warning 'Benchmarks 5535 F 1978 and 5535 H 1978 are based on one differential levelling connection and do not meet the quality control standards of NOS. Therefore, caution should be used when deriving elevations for these marks'.