Recording the surface pressure

The device calculates the depth by measuring the variation of pressure between the surface and where it is located under water. Therefore it needs to have a reference measurement of the surface pressure. This can be done by navigating to :

OPTIONS > SENSORS > DEPTH > SURFACE

Once you get the CALIBRATED message on the screen that means the device recorded the current atmospheric pressure as reference.

This needs to be recalibrated mainly when diving at altitude or diving during extreme weather conditions

Obviously … DO NOT ADJUST SURFACE PRESSURE IN THE WATER