Raymarine Remote display Owner's Manual page 40

Remote Display
Boat Speed reads 0
Information being transmitted from the Hull Transmitter is being received
with a zero value. Check the paddle wheel for fouling, clean it and make
sure it turns easily.
Wind Speed reads 0
Information being transmitted from the Wind Transmitter is being
received with a zero value. If the anemometer cups at the top of the mast
are turning and the wind speed reads zero then there is a problem with
your Wind Transmitter.
No NMEA data showing on external displays
From any digital display enter Setup and Calibration Mode (page 18)
and scroll through to the Health Chapter. Check the signal level and
battery status of the Wireless (NMEA) Interface. If the signal level shows
a value of greater than 3 then check the data connections and the
settings of the NMEA source equipment to ensure that NMEA 0183 is
being transmitted correctly.
The Depth Alarm does not sound
If the actual water depth is shallow and the alarm has not sounded it is
most likely that the alarm is switched off. From any Digital Display enter
Setup and Calibration Mode (page 18) and scroll through to the Depth
Chapter. Ensure the Depth Alarm settings are correct.
Note: * The "Master Display" is normally the display which was used to
power up the entire system. This display may be different each time the
system is used. If the system is powered up using a Remote Display and
that display is in Pocket Mode, the Remote Display will hand over the
function of "Master" to another display on the network in order to
maintain network continuity if the Remote Display is taken out of network
range.
If you are fault finding and are uncertain which display is the Master,
switch off the system and switch on again (using a display other than a
Remote Display). The display which you switched on is now the Master.
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