Tide station
A place at which tide observations are being taken. It is called a primary tide station when continuous observations are to be taken over a number of years to obtain basic tidal data for the locality. A secondary tide station is one that is operated over a short period of time to obtain data for a specific purpose.
Source http://www.kennisbank-waterbouw.nl/Glossary/printUK.php?subject=@Зураг