Raymarine stand-alone master instrument - Manual (Page 22)

Chapter 3: Fault Finding 19
Note: After installation, poor performance may be experienced if the
surface of the depth transducer has not been 'wetted'. Wetting can take
up to 24 hours under normal conditions. The transducer can be wetted
prior to launch by applying a mild detergent to the external face.
Fault Cause Action
Failure of a group of
instruments in a chain
Cabling or connector
problem
Check the security of
the connectors between
functioning and
non-functioning
instruments
Unable to enter
calibration
Calibration locked Refer to Calibration
lock/unlock section