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Old 05-09-2010, 13:43   #1
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Getting the GPS Data from AIS

I am using the Open system at work, and have found hooking up to the pilot plug in the back of our AIS works for getting AIS data, but the system would not accept GPS data.

I tried every diffrent configuration I could think of (in the tool box), and of course I tried the "Shared AIS" tool for GPS input.

I ended up hooking up my GPS mouse to a USB port and getting my GPS data that way.

We use a JRC, model JHS-182 AIS, and I used a pilot plug to serial port cable.

Any suggestions?

THanks

JSB
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Old 06-09-2010, 03:02   #2
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Very odd - shared port works for me. You may wish to verify your AIS transceiver is actually emitting gps position data using a terminal or another NMEA compatible navigation programme.
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Old 06-09-2010, 04:48   #3
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I cannot talk about the specifics of Open CPN, however, GPS data and AIS data are transmitted at different data rates, today they may even be using different protocols as NMEA2000 gains headway. Therefore you need to ensure that the output is compatible with the receiver, and sometimes the use of a multiplexor is the only way to go, although I prefer to input via different (USB) Comm ports.
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Old 06-09-2010, 10:45   #4
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My AIS transceiver puts out both GPS and AIS data in old school NMEA, I can read it using the "shared" setting. What sort of data are you getting in the NMEA terminal window in opencpn?
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Old 06-09-2010, 11:32   #5
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Folks...

Here is what I think is going on.
A professional AIS transponder sends data out its "ECDIS" port.

This data would be 38KBaud, and contain AIVDM sentences for detected AIS traffic, and AIVDO sentences for ownship position and speed. It probably does not contain $GPRMC messages, or any other standard NMEA positioning messages.

Opencpn current version does not decode AIVDO sentences. This is planned for the 2.2 release.

Please stay tuned
Dave
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Old 06-09-2010, 12:18   #6
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That makes sense

Quote:
Originally Posted by bdbcat View Post
Folks...

Here is what I think is going on.
A professional AIS transponder sends data out its "ECDIS" port.

This data would be 38KBaud, and contain AIVDM sentences for detected AIS traffic, and AIVDO sentences for ownship position and speed. It probably does not contain $GPRMC messages, or any other standard NMEA positioning messages.

Opencpn current version does not decode AIVDO sentences. This is planned for the 2.2 release.

Please stay tuned
Dave
Now that makes sense, this is one of the newest AIS systems. and I get a strong data feed when I use the "shared AIS" or comm port 1 (which is my serial port).

No big deal, I have a Nobletec program on my laptop, and the boat uses Rose point on the laptop by the gyro. Just wanted to have another backup progam if I get moved to a boat without AIS/Laptop system already installed.

Thank you everyone for the inputs.

It has been mentioned before, but thought I would restate something from the commerical side; If you ever worry about a commerical vessel "seeing" you, I can tell you AIS transmitter is a big plus. Many of times a small pleasure vessel has shown up on AIS long before I can visual them, or get a radar return.

Thanks again for the inputs.

JSB
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Old 06-09-2010, 13:09   #7
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Quote:
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It has been mentioned before, but thought I would restate something from the commerical side; If you ever worry about a commerical vessel "seeing" you, I can tell you AIS transmitter is a big plus. Many of times a small pleasure vessel has shown up on AIS long before I can visual them, or get a radar return.
Good to hear
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