NAV6 Series NAVTEX System User Guide
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Connecting Power
The NAV6 should be powered from a nominal 12Vdc switched supply, capable of providing a
continuous 350mA.
To allow the unit to be isolated for service, a 1.5A circuit breaker or a 1.5A fuse and switch
should switch the power supply.
Use the RED and BLACK twisted pair for connection to the boat’s power supply.
Connect the RED wire to boat’s positive (12V) supply.
Connect the BLACK wire to negative (0V) supply.
Note that vessels that require isolation may need to install a DC to DC converter (ICS part
number 500.09) – if in doubt ask your dealer.
24V vessels should install a 24V / 12V DC to DC converter (ICS part number 500.10). – if in
doubt ask your dealer.
Connecting an NMEA Source
Use the BLUE and BLACK twisted pair for connection to the NMEA data source.
Connect the BLUE wire to the NMEA A signal.
Connect the BLACK wire to the NMEA B signal.
(Trouble shooting: Note that NMEA signal terminology can vary between manufacturers – try
swapping the BLUE and BLACK wires if the NMEA input does not work initially – no damage
will be done)
The NAV6 is compatible with most sources of NMEA0183 data such as a GPS receiver or
adapter boxes supplied for use with networked instrument systems. Please note that you may
need to program the source of NMEA data to send the correct sentences in the correct format.
You may also need to purchase an NMEA adapter box for your instrument system. Should you
be uncertain of your abilities in this area, you are strongly advised to seek the services of a
qualified marine electronics installer.
Note: We do not guarantee compatibility with all GPS receivers or all instrument systems.
However, this can normally be achieved for most systems by a skilled installer. For notes on
achieving compatibility with various systems, see the NAV6 FAQ section on our web site:
The NAV6plus uses NMEA data for the following:
To synchronise its internal clock with UTC time.
To display a wide variety of NMEA data in a selection of formats (see Appendix III for the
NMEA sentences supported).
To automatically filter the message display to show either messages from only the nearest
NAVTEX transmitting station, or all stations that are currently within range.
Connecting the Programming Signal
The programming signal (GREEN and BLACK twisted pair) is not required for normal operation
and should be left unconnected.
