Confirm that the pressure readings are as expected. If the approximate deployment depth is known, it can be compared to the measured pressure and checked to see if they match, as 1 dBar corresponds to approximately 1 meter of seawater.
Pressure is measured during every deployment and reported in units of dBar. To be able to measure the hydrostatic pressure at the instrument, that is the pressure exerted by the water above due to gravity, a pressure offset should be made just before deployment to correct for local atmospheric pressure at the surface. Pressure readings are not particularly important in terms of the quality of current measurements, but they can provide an estimate of instrument depth.
The pressure depends on the depth and density of the water. The deeper and greater density, the higher the pressure. In addition, the pressure is proportional to the gravitation acceleration, which differs slightly across the earth. The tide will produce regular variations of pressure for submerged instruments. A typical cause of irregular or excessive change of pressure is drag-down, which will be discussed later.
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