Motion Reference Unit (MRU)
In order to operate correctly, the CS90 requires input from a motion reference unit (MRU). By default, the CS90 uses a built-in motion sensor. It is placed inside the Motor Control Unit. For improved operational accuracy, an external motion reference unit (MRU) may be used.
Note
Without the input from a motion reference sensor, the CS90 will not be able to compensate for the vessel movements. This lack of compensation will prevent the CS90 from providing correct echo information.
The CS90 has been designed to match the motion reference unit (MRU) sensors manufactured by Kongsberg Seatex. Descriptions of all available types are provided on their website.
For the motion sensor unit (MRU) to communicate with the CS90, it must support the following interface format:
•  Kongsberg EM Attitude 3000
The EM Attitude 3000 is a proprietary datagram format created by Kongsberg Maritime for use with digital motion sensors. It holds roll, pitch, heave and heading information. The datagram contains a 10-byte message.
Kongsberg Maritime may provide a suitable motion reference unit. Consult your local dealer or agent for more information.
Motion Reference Unit (MRU) Part number In the box
Seatex MRU-D Motion Reference Unit (MRU)
Documentation