=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Feb-2016
Herne Bay is a new station operated by the Channel Coastal Observatory (CCO) based at NOC Southampton. Instrument type is an Etrometa Step Gauge. The Datum of the data is Admiralty Chart Datum (ACD) 8.244m below TGBM. Tide Gauge Zero (TGZ) is 9.034m below the Primary benchmark TGBM and 0.79m below ACD. The CCO have confirmed that the step gauge has electrdes only to one side so piling up or down of waters can lead to over or under recording depending on the direction of the swell. Because of this data should be used with caution.