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#21
posted to rec.boats.cruising
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nmea - talkers - listeners and lessons learned.
On Jul 19, 10:38*am, Josh Assing wrote:
The SR161 can be used to consolidate incoming NMEA positional data from a GPS with the AIS NMEA data into a combined high-speed data stream on a single serial port. In that scenario there is no need for any multiplexer. but how does it talk to other non-high speed nmea devices then? Basically you can take any inbound NMEA data stream or combined datastreams at 4800 and the SR161 will combine that data with the AIS data and output the combine original and AIS data streams on a single outbound port. It is only for inbound data. You can't have two way communication to the original NMEA devices - just an inbound feed to the AIS receiver from the NMEA data stream. |
#22
posted to rec.boats.cruising
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nmea - talkers - listeners and lessons learned.
On Jul 20, 8:59*am, Doug Miller wrote:
... GPS does affect AIS perfofrmance but of course you'll need a GPS for your nav package in order to calculate collision information (e.g. distance from you, closest point of approach and time to closest point of approach). Thanks for that. Just to be clear, I have GPSes on my system and the computer that will run my AIS software already has GPS positioning data. What I think you are saying is that I should route one of the GPSes through the SR161 when I install it to make the 161 work better. Is that right? Cheers, -- Tom. |
#23
posted to rec.boats.cruising
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nmea - talkers - listeners and lessons learned.
On Sun, 20 Jul 2008 09:02:35 -0700 (PDT), Doug Miller
wrote: On Jul 19, 10:38*am, Josh Assing wrote: The SR161 can be used to consolidate incoming NMEA positional data from a GPS with the AIS NMEA data into a combined high-speed data stream on a single serial port. In that scenario there is no need for any multiplexer. but how does it talk to other non-high speed nmea devices then? Basically you can take any inbound NMEA data stream or combined datastreams at 4800 and the SR161 will combine that data with the AIS data and output the combine original and AIS data streams on a single outbound port. It is only for inbound data. You can't have two way communication to the original NMEA devices - just an inbound feed to the AIS receiver from the NMEA data stream. I found that neither of my navigation programs (Ozi Explorer and Tiki Navigator) could handle the combined NMEA/AIS signal from the SR161 - or more correctly, they couldn't be set to accept both NMEA and AIS on the same serial port. I understand that some other nav programs will accept the combined data. -- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
#24
posted to rec.boats.cruising
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nmea - talkers - listeners and lessons learned.
On Jul 20, 5:03*pm, Peter Bennett wrote:
On Sun, 20 Jul 2008 09:02:35 -0700 (PDT), Doug Miller wrote: On Jul 19, 10:38*am, Josh Assing wrote: The SR161 can be used to consolidate incomingNMEApositional data from a GPS with the AISNMEAdata into a combined high-speed data stream on a single serial port. In that scenario there is no need for any multiplexer. but how does it talk to other non-high speednmeadevices then? Basically you can take any inboundNMEAdata stream or combined datastreams at 4800 and the SR161 will combine that data with the AIS data and output the combine original and AIS data streams on a single outbound port. It is only for inbound data. You can't have two way communication to the originalNMEAdevices - just an inbound feed to the AIS receiver from theNMEAdata stream. I found that neither of my navigation programs (Ozi Explorer and Tiki Navigator) could handle the combinedNMEA/AIS signal from the SR161 - or more correctly, they couldn't be set to accept bothNMEAand AIS on the same serial port. *I understand that some other nav programs will accept the combined data. -- Peter Bennett, VE7CEI * peterbb4 (at) interchange.ubc.ca * GPS andNMEAinfo:http://vancouver-webpages.com/peter Vancouver Power Squadron:http://vancouver.powersquadron.ca One solution I have recommended to folks with this issue that works quite well is to use something like GPSGate (http://www.gpsgate.com/ index.php?id=13) to take the input from a real serial port and duplicate it onto two virtual serial ports. Then connect each of the virtual serial ports to your nav software. For example, I believe you need to do this with MaxSea. Also would be a good idea to give feedback to the nav program authors that they should support multiple data streams on one port since this issue will also come up if you use a multiplexer to consolidate NMEA data streams. Doug Miller |
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