Driver for decoding the depth value from a Navitracker Density Probe as a "ROV Depth" observation.
Towed behind a vessel, this probe measures continuously the sediment density.
In order to decode the sediment density, please refer to document Decoding Density Observation.
Besides the depth value it outputs also the x-offset and the layback of the sensor.
In order to decode the x-offset and layback, please see document Decoding Position.