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We meet 3 times a year to consider place names.

Tidal streams are the periodic horizontal movement of water. These have the same astronomical causes as tides, which move in a vertical direction.

Sea level data recorded at the monitoring sites shown on the map is available for download.

The NHN ensures that important precise levelling control marks are retained and that geometric heights are determined for new control marks when they are established. This enables users to connect their datasets to the official geodetic datum.