Special Publication No. 9 Permanent Committee for Tides and Mean Sea Level   Preface   Contents   Introduction   1.  Tides, sea level, and water currents   2.  Tide gauges   2.1  Description 2.2  Types of water level sensors 2.3  Recording devices 2.3.1  Chart recorder operating procedures 2.3.2  Digital recorder operating procedures 2.4  Tide gauge specifications 2.4.1  Precision, accuracy, and resolution 2.4.2  Requirements for accuracy and replacement 2.5  Measurement system defects 2.6  Calibration   3.  Survey and levelling   4.  Current meters   5.  Australian standard ports   6.  Digital data handling   7.  Contact list, useful links, and bibliography     Download a printable version of SP-9 (PDF~1.4 Meg)