Sea pressure
Sea pressure is the difference between the pressure measured underwater by your RBRlegato⁴ and atmospheric pressure. The units of measurement are dbar (decibars).
\[\text{Sea pressure} = \text{absolute pressure} - \text{atmospheric pressure}\]
where absolute pressure (in dbar) is the value measured directly by your RBRlegato⁴, and atmospheric pressure is a default value of 10.1325dbar.