Page 8 of 38
2021-06-24
CU-M001 User manual
Speed
The screen presents speed through water (STW) used for the autopilot, radar and logged on the
voyage data recorder (VDR). The speed data can also be used for setting limits on the rudder and
stabilizer wings. It also shows speed over ground (SOG) used as a primary system for speed. Some
of this information is also available from the GPS systems. By adding an approved gyro heading
input into the system, together with parameters of the vessel, it is possible for the system to calculate
the transversal speed at any point of the vessel. This feature known as docking, allows the pilot to
be sure that both the fore and aft of the vessel are under tight control.
Alarms/Alerts
This system does not contain any alerts, however a power failure relay is available
Distance
In addition the system shows distance travelled through water, and distance over ground and has
a resettable daily trip counter. This information is used for service intervals and navigation. Extra
information is available regarding the sea temperature and tilt of the vessel. Note. The Distance over
ground measures only when the bottom is within range.
The control unit
The user can operate the system via a touch screen or using an application on the conning unit.
The displays are intuitive and have a menu system, but also allows the user to click on the screen
to adjust the relevant parameters. Full setup, calibration and diagnostics are available from the
screens. Calibration is performed by a two leg sailing procedure, and once set, should not need
repeating unless the sensor is moved.
Maintenance
The system is low maintenance. After initial setup and calibration, the system requires no attention
except to change alert parameters if required. The sensor is exposed to the water and over time
some growth may appear. This can be carefully removed when possible, and is normally not a
problem except if the vessel is still for longer periods of time (weeks) in warm waters. The effect of
this growth is usually seen as the range of the bottom track being reduced.
Diagnostics
The system has comprehensive built in test (BIT) that can be used to analyse the performance of the
equipment and give a warning if the data is not within specification. It also has inbuilt redundancy in
some areas, such that even if a failure occurs, it can still give some data. Due to the systems LAN
network point, it is possible to set up the system for remote diagnostics and upgrade using network.
In time this will help reduce service visits and increase the probability of first time fix. Inserting a USB
stick into the electronic unit causes the system to log all the available parameters, and these files
can be sent to skipper or your service provider to diagnose errors in the system
