Valeport TideMaster Operating Manual page 33

Section 7 | Calibration
7.1.2.2 Offset
If the Transducer is below the Datum, the Offset should be entered as a negative value. If the transducer is
above the Datum, the Offset should be entered as a positive value.
To check the operation of the unit with these user input values, select cal check to view data from the
transducer in both pressure (dBar) and Depth (m/ft) formats.
In practice, however, it is much preferred to carry out a calibration of the transducer in-situ to take out the
density and gravity variations and establish the datum, as described in
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Section 7.3.
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