Nmea issue

[markymarkP]

Hi all,
I have a new icom ic-m411 radio, and it has a import/export wire to the rear for the nmea data

Now the old radio died, hence the change,many that always worked fine, and the navman gps sent it the data for the radio to know where it was etc

Also fitted to the rib is a Lowrance hds8

I have tried connecting the icom to the navman, but it would not pick up the data, so then I tried the Lowrance, and also no luck. The boat also has a navbus, and from what I can see, I should connect it to the white wire??

Am I doing something wrong? There is a nmea+ and Nmea- so I just don't get what I am missing! I don't mind which system I connect it to, as long as it works!
Is there a setting I have to enable on something?

About to call a marine engineer, but hope maybe someone on here can give a clue

[Erin]

The Icom radio will only recognise/accept nmea0183 which I suspect navbus is not. You will need to work out which wire from either your Navman or Lowrance is the tx+ (transmit positive) and connect that to the centre pin on the Icom input wire. You also need to connect the outer pin/screen wire of the Icom to the tx- or ground wire on the gps unit. I don't think there is any setting on the Icom to turn on or off the reception of position data, but it would be worth a double check in the instruction book as there are definitely some features that come turned off by default. Also make sure that the GPS unit has it's output ports turned on and that the nmea data is standard not high speed.

[markymarkP]

Great thanks, so looking at the hds instructions the options are:
Yellow : receive
Orange : transmit
Shield : ground
Blue : receive
Green : transmit

So middle core of icom to orange, and outer shield to hds shield??

[Erin]

Seems sensible. Presumably there are 2 transmit and 2 receive wires as there are two nmea ports available on the HDS. If that is the case then pick either one, but certainly your proposal should work.

[markymarkP]

Thanks chap, will have a bash tomorrow and let you know how it goes
Much appreciated

[9D280]

I think Lowrance assume you will be using NMEA2K for everything, so you will probably have to turn on the NMEA0183 in some setup menu on the plotter......