I started to post this in the Simrad Radar
thread. I am glad I did not.
I am trying to plan an upgrade to use Broadband Radar
over IP Wifi
. The current equipment
1997 ST4000 Wheel Autopilot seatalk
2005 ST60 Wind
and Tridata seatalk
1997 Autohelm Fluxgate
Heading Sensor M92580 which outputs Nmea
2013 Globalsat BR-355 GPS
hardwired+5vdc to VHF
I am retiring the 1997 RL9 Radar next year.
The Heading Sensor outputs Nmea 0183
. Is this adequate?
"Magnetic Sensor NMEA 0183
HDM, HDT, VHW or HSC, data sentences. "
"Designed to output NMEA 0183 HDV sentence for the radar, can supply data for up to 2 external Nmea 0183 inputs."
As far as I can determine, Heading Data is needed for
- Radar - Direct wire from Fluxgate
to Radar - OK
- ST4000 Autopilot (1) Nmea In on the Autopilot wired to GPS
Can hardwire GPS Nmea signal or Fluxgate Heading, but not both.
I am removing the old RL9 Radar which also had a Nmea In for the Heading. I do not know if that got onto the Seatalk Bus. Does Wind
or Autopilot need heading? - I think so.
Here is what I think needs to be done:
BR-355 GPS Mouse hardwired to VHF
BR-355 GPS Mouse hardwired to ST4000 Wheel
Flugate Heading hardwired to Radar Nmea In (can do one more Nmea)
New Seatalk-Nmea Multiplex Wifi
Seatalk ---> Nmea In Converts Seatalk + GPS data
Seatalk <--- Nmea Out Allows WPTS, XTE to be sent to Autopilot
Nmea ----> Nmea In AIS on Opencpn
, & AIS GPS as Priority2
Heading Nmea --> Nmea In (Do I need this for Autopilot & Wind?)
+ Wifi Ship's OpenCPN
and Android Tablets. (no wires)
Option: Add a USB to plug
in the GPS Mouse, then the Heading sensor could use that Nmea In on the ST4000 Wheel.
However the GPS would still need to be wired to VHF/DSC.
Option: Also you could add one or two ethernet ports
in hopes that someone will figure out how to transmit radar over wifi (Furuno does this) so we would have no wires other than power to our computers
Next year, add Broadband
Radar with USB 3.0 to Gbit Ethernet ($20)
connected directly to the radar ethernet with power and heading wires.
I am considering not connecting VHF/DSC to Opencpn because it gets too complex, so this information will not be available on computers
unless the AIS takes care of it.
VHF/DSC Nmea ---> Nmea In
VHF/DSC Nmea ---> Nmea Out
What is lost
by doing this?
- Does ST60 Wind require heading data?
- Does AIS require heading data?
- Does the AIS send GPS data interleaved at 38000 baud?
- Does the AIS provide VHF/DSC Nmea In and Out connections?
Sorry I was going to limit this to two questions, did not succeed. Any thoughts would be appreciated.