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Old 03-06-2006, 03:24   #61
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Join Date: May 2006
Location: On board Sarah, currently lying in Jacksonville, FL
Boat: Pearson, 424, 42', Sarah
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I don't know how far you've gotten in programming the AIS engine, but you might want to take a look at this link from the DigiBoat web site (SOB software). They modified the NASA engine to provide LED status lights. I'm sure they had lots of initial problems trying to talk to the box while it just sat there doing nothing, just a black box.


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Old 03-06-2006, 04:40   #62
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John. I was actually thinking of getting the SR-161 which seems to have LED lights already.

I notice they are now producing a CLASS B AIS transponders for recreational boats. Price isn't too bad, $1500:

As for the programming, I have a program that will decipher all of the VDM messages, including the ones that are multi sentences but I am just using the sample files from Fugawi and NASA as input. I'm waiting for a NMEA multiplexer/combiner that I ordered before trying to send the AIS to ARPA translated messages to my Furuno radar.

Now trying to figure out how to do the programming to figure out the CPA (Closest Point of Approach). Ie: if you know the lat/long, SOG and COG for two boats, how do you predict how close they will come to one another?


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