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AIS with RTL2832 stick on RPi3
#1
Hi folks, I just need a little help troubleshooting my AIS in OpenCPN, on Raspberry PI. Latest version OpenCP.

I am able to use the the Radio GQRX feature in SDR Receiver to tune in my local FM radio station, so it seems the stick is working OK.

When I go into OpenCPN, I can't see any targets in my local bay (but I know from an online, web based service that there are).

It is of course possible that I'm just not in range (i'm about 7km inland from the water), and I only have the very small antenna that came with the stick.

SO, a) when I hit "take a look", I see 2 pretty rough bands of reception at the AIS frequencies, but not very neat. How is this SUPPOSED to look?

b) do I need to add in the USB stick as a "Connection" in OpenCPN, or is that part supposed to be automatic? At the moment, I have nothing in connections.

c) at the moment I don't have GPS, as the hardware has not arrived. Is a GPS fix a prerequisite of receiving AIS Targets? Huh

If anyone can give me a few troubleshooting ideas, that would be great!

Matthew P
Brisbane, Australia
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#2
Seems like your antenna to me.

Opencpn will get ais from an nmea 0183 feed from openplotter not specific to ais.

Gps not necessary for ais but will help you test that the nmea feed is working.



Sent from my Moto G (5) Plus using Tapatalk
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#3
You should not need a GPS but check that you have a correct connection set up in OpenCPN. I should match the OpenCPN outgoing NMEA0183 connection in OpenPlotter.
TCP in on localhost:10109.
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#4
its probably your antenna, try to get closer if possible or get a better vhf antenna .
B) automatic you don't need to do anything.after you calibrate to find gain and correction (ppm) values. the port should be installed by default in opencpn connections.
C) no
https://sailoog.gitbooks.io/openplotter-...ongle.html
https://sailoog.gitbooks.io/openplotter-...eiver.html
https://www.dropbox.com/s/td07mj4x1t3wrbq/ais.rtf?dl=0
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#5
You must calibrate the SDR.
You can get some boat with the small antenna only if you are close to targets. You need a VHF antenna.
No GPS needed nor opencpn settings, defaults will work.
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