GPS showing wrong date

If you modify the date on the output stream, you still have the problem of the device using the wrong date to:
Apply offsets from GPS time to UTC
Looking up locations in the satellite almanac
Applying base station offsets
 
The nicest thing would be a small, very low power NMEA to Seatalk adapter. The idea would be to cut the existing seatalk GPS cable under the deck near the Raystar, insert the adapter which would draw its power from the existing seatalk cable and then also power the new low cost GPS receiver on the nmea side. The raymarine convertor (if you can still find any) are eye wateringly expensive - especially if you just want a unit to transfer all the gps and related data (COG/SOG etc) generated by the new receiver.
 
DipperToo said:
The nicest thing would be a small, very low power NMEA to Seatalk adapter. The idea would be to cut the existing seatalk GPS cable under the deck near the Raystar, insert the adapter which would draw its power from the existing seatalk cable and then also power the new low cost GPS receiver on the nmea side. The raymarine convertor (if you can still find any) are eye wateringly expensive - especially if you just want a unit to transfer all the gps and related data (COG/SOG etc) generated by the new receiver.
Click to expand...

Maybe this :

Nmea4Wifi - Introduction

I have no connection to the producer - but am a very happy user of the gear ... it works ! At vastly less cost than others !!
 
DipperToo said:
The nicest thing would be a small, very low power NMEA to Seatalk adapter. The idea would be to cut the existing seatalk GPS cable under the deck near the Raystar, insert the adapter which would draw its power from the existing seatalk cable and then also power the new low cost GPS receiver on the nmea side. The raymarine convertor (if you can still find any) are eye wateringly expensive - especially if you just want a unit to transfer all the gps and related data (COG/SOG etc) generated by the new receiver.
Click to expand...
Quark electronics
 
DipperToo said:
The nicest thing would be a small, very low power NMEA to Seatalk adapter. The idea would be to cut the existing seatalk GPS cable under the deck near the Raystar, insert the adapter which would draw its power from the existing seatalk cable and then also power the new low cost GPS receiver on the nmea side. The raymarine convertor (if you can still find any) are eye wateringly expensive - especially if you just want a unit to transfer all the gps and related data (COG/SOG etc) generated by the new receiver.
Click to expand...
Could use this
https://digitalyacht.co.uk/product/gps160-seatalk/

Not cheap, but cheaper than a Raymarine work around.
 
DipperToo said:
I will probably go for a second hand Raymarine multiplexor from Ebay at c£70 and I have an nmea GPS somewhere.,
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Why do you need multiplexing or seatalk adaptors?
I fitted a new nmea gps direct to a c80 which has the same single speed nmea port to solve year problem.
I am planning to replace this with an 0183 ais transceiver which will provide the GPS sentences but at higher baud rate along with the ais.
The only issue I have is my dsc radio won't "hear" the chartplotter any longer. The autopilot still gets its instructions through the seatalk bus to the chartplotter.
So I will dedicated the nmea gps mushroom to the radio.
A bonus is you have a both redundancy and power saving as your nav gear can be turned off and you can still get an hourly lat long for your chart.

GPS mushroom
RS232 GPS Marine GPS Receiver Antenna Module NMEA 0183 Rate 4800 Voltaonn 4712631899293 | eBay
 
TSB240 said:
Why do you need multiplexing or seatalk adaptors?
I fitted a new nmea gps direct to a c80 which has the same single speed nmea port to solve year problem.
I am planning to replace this with an 0183 ais transceiver which will provide the GPS sentences but at higher baud rate along with the ais.
The only issue I have is my dsc radio won't "hear" the chartplotter any longer. The autopilot still gets its instructions through the seatalk bus to the chartplotter.
So I will dedicated the nmea gps mushroom to the radio.
A bonus is you have a both redundancy and power saving as your nav gear can be turned off and you can still get an hourly lat long for your chart.

GPS mushroom
RS232 GPS Marine GPS Receiver Antenna Module NMEA 0183 Rate 4800 Voltaonn 4712631899293 | eBay
Click to expand...
I went in circles with raymarine as it was not exactly known if position data might be truncated by one or two points when passed across to the seatalk bus.
My C80 has the nmea set at 38400 as I have an ais transponder fitted. I discovered a setting in the transponder to allow it to pass its dedicated gps data along with the ais data to the C80 which is my interim 'fix'. Raymarine stated that using this approach 'Stricly speaking, AIS units should not be set to output their GPS (various reasons, the main one being network latency and data loops). ' Also, they told me that not all their instruments with nmea data inputs will rebroadcast the date setnances!
Apart from the radio which needs position data, I also have an ICS nevtex which acts as a repeater and trip log. The trip log also needs the full time/date to work. Also, as the ICS unit takes its date from the nmea data stream, there are no weather reports shown!
I would like the gps to work without needing the ais and plotter turned on for these reasons.
Getting access to the existing seatalk cable run and putting a new nmea gps cable through is not very accessible at all in my boat - hence the approach I was thinking about with a convertor of some type in the aft area below where the pushpit gps receiver sits so I can simply cut the seatalk cable and use its power and existing connections for the convertor and new nmea gps receiver.
 
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