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Old 05-08-2023, 08:14   #1
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Ignore sentences when priority source is available
We have two sources of NMEA data.

1) vesper cortex that’s always on
2) B&G system that’s on when we are underway

We leave OpenCPN on and use the Vesper Cortex data for anchor watch and AIS while anchored.

When we are underway and have the B&G system on, OpenCPN bounces around using heading data from both. This causes issues with the radar plug-in showing incorrect overlays on the chart.

It sometimes looks like OpenCPN is using the magnetic heading data from the Vesper as true heading and that’s what’s causing the issue but I’m not sure.

I’ve set the priorities to all be the B&G data but it still will bounce to the vesper randomly.

Any pointers to correct this?
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Old 05-08-2023, 08:27   #2
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Re: Ignore sentences when priority source is available
crayiii...
Do you have both headings in Options=>Connect: "Adjust communication priorities.."?
If so is the B&G heading set as Prio 0? (In uppermost position while both are present)
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Old 05-08-2023, 09:04   #3
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Re: Ignore sentences when priority source is available
Quote:
Originally Posted by Hakan View Post
crayiii...
Do you have both headings in Options=>Connect: "Adjust communication priorities.."?
If so is the B&G heading set as Prio 0? (In uppermost position while both are present)

Yes, B&G is set to 0. It almost seems like the mag var is being set twice. I have the WMM plug-in disabled and set it to zero in the settings under units.
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Old 05-08-2023, 13:40   #4
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Re: Ignore sentences when priority source is available
If the B&G true heading is correct I don't understand why it's not used as prio 0. (Unless it's not received faster than every 10 seconds)

If you set the variation manually to zero you'll of course have a problem unless in a zone without variation. Why disable WMM? I'd enabled it if I've received a magnetic heading.
Old devices can transmit a false variation if the inbound WMM-table is outdated. Can that be the cause? (Try to set its variation manually to 0.0, if possible, then WMM will "take over")
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Old 05-08-2023, 13:42   #5
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Re: Ignore sentences when priority source is available
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If the B&G true heading is correct I don't understand why it's not used as prio 0. (Unless it's not received faster than every 10 seconds)

If you set the variation manually to zero you'll of course have a problem unless in a zone without variation. Why disable WMM? I'd enabled it if I've received a magnetic heading.
Old devices can transmit a false variation if the inbound WMM-table is outdated. Can that be the cause? (Try to set its variation manually to 0.0, if possible, then WMM will "take over")

It looks like OpenCPN is honoring the priority settings perfectly. It’s the radar plug-in that seems to ignore it.
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Old 05-08-2023, 23:30   #6
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Re: Ignore sentences when priority source is available
And what's the radar plugin settings for heading in preferences?

Since you're using NMEA0183 heading data into OCPN I think all three checkboxes concerning heading should be disabled.
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Old 06-08-2023, 02:56   #7
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Re: Ignore sentences when priority source is available
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And what's the radar plugin settings for heading in preferences?

Since you're using NMEA0183 heading data into OCPN I think all three checkboxes concerning heading should be disabled.

Yes, all the check boxes are unchecked. For now, I just disable the Vesper Cortex source when underway and when anchored, enable that source for the anchor watch.

I did a video with the radar info box next to the dashboard heading (M and T) and you can see the radar bouncing between the sources but the dashboard remaining stable. Unfortunately, it doesn’t look like I can post a video here.
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Old 06-08-2023, 06:09   #8
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Re: Ignore sentences when priority source is available
crayiii..
What I know the radar plugin should use the same prioritized heading data as used by OCPN core.

In first hand true heading, Hdt, if available. (Note: watchdog for no data here is 5 seconds)
Second magn heading, Hdm, + WMM correction.

Q- You're using latest radar plugin, v.5.5.x, I suppose?
Q- The B&G hdt is hopefully received more frequently than 5 seconds?
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Old 06-08-2023, 06:17   #9
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Re: Ignore sentences when priority source is available
Quote:
Originally Posted by Hakan View Post
crayiii..
What I know the radar plugin should use the same prioritized heading data as used by OCPN core.

In first hand true heading, Hdt, if available. (Note: watchdog for no data here is 5 seconds)
Second magn heading, Hdm, + WMM correction.

Q- You're using latest radar plugin, v.5.5.x, I suppose?
Q- The B&G hdt is hopefully received more frequently than 5 seconds?

Yes, we are using the latest plug-in. The B&G heading is sending updates very quickly when I view the NMEA stream. It almost looks like the plug-in is applying a correction to a true heading so it’s getting corrected twice. Again, it’s only doing that with the Vesper Cortex source.

The Vesper Cortex sends its own internal heading over NMEA unless it receives a heading from the B&G (when we turn the nav system on), then it repeats the B&G as the heading. I think that’s where the issue arises.

For some reason I can’t get the plug-in to ignore the Vesper Cortex heading data when the B&G data is available.
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Old 06-08-2023, 06:24   #10
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Re: Ignore sentences when priority source is available
I can't say I can follow your description about what the Vertex system supplying.

Maybe a NMEA debug window copy of the hdt, hdm from Vertex and B&G?
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Old 06-08-2023, 06:53   #11
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Re: Ignore sentences when priority source is available
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I can't say I can follow your description about what the Vertex system supplying.

Maybe a NMEA debug window copy of the hdt, hdm from Vertex and B&G?
The first part of the stream is with the B&G system on and the Vesper was repeating the B&G data. I've noted where I shut the B&G system off and the Vesper began sending it's internal heading data.

B&G - 192.168.8.202
Vesper - 192.168.8.175

<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,160.9,,,15.1,W*03<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:21 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,158.0,0.0,E,15.1,W*6A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.0,,,15.1,W*0B<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.1,,,15.1,W*0A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.1,,,15.1,W*0A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.1,,,15.1,W*0A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.1,,,15.1,W*0A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.1,,,15.1,W*0A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.1,,,15.1,W*0A<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.2,,,15.1,W*09<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.2,,,15.1,W*09<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.2,,,15.1,W*09<0x0D><0x0A>
<GREEN>09:33:22 (TCP:192.168.8.175:39150) $AIHDG,161.2,,,15.1,W*09<0x0D><0x0A>

********TURNED OFF B&G*********

<GREEN>09:33:23 (TCP:192.168.8.175:39150) $AIHDG,159.6,0.0,E,15.1,W*6D<0x0D><0x0A>
<GREEN>09:33:24 (TCP:192.168.8.175:39150) $AIHDG,158.9,0.0,E,15.1,W*63<0x0D><0x0A>
<GREEN>09:33:25 (TCP:192.168.8.175:39150) $AIHDG,160.1,0.0,E,15.1,W*60<0x0D><0x0A>
<GREEN>09:33:26 (TCP:192.168.8.175:39150) $AIHDG,159.3,0.0,E,15.1,W*68<0x0D><0x0A>
<GREEN>09:33:27 (TCP:192.168.8.175:39150) $AIHDG,159.8,0.0,E,15.1,W*63<0x0D><0x0A>
<GREEN>09:33:28 (TCP:192.168.8.175:39150) $AIHDG,161.3,0.0,E,15.1,W*63<0x0D><0x0A>
<GREEN>09:33:29 (TCP:192.168.8.175:39150) $AIHDG,160.3,0.0,E,15.1,W*62<0x0D><0x0A>
<GREEN>09:33:30 (TCP:192.168.8.175:39150) $AIHDG,161.1,0.0,E,15.1,W*61<0x0D><0x0A>

Here is the stream capturing both the B&G heading and the Vesper which is repeating the B&G heading. It looks like the Vesper is sending true heading that it's getting from the B&G system an repeating it with the variation so OpenCPN applies the variation to an already corrected heading value.

That said, I would have thought OpenCPN would ignore the Vesper since it's a lower priority than the B&G.

<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.6,,,15.0,W*02<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.8,,,15.1,W*0C<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.8,,,15.1,W*0C<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
<GREEN>09:40:50 (TCP:192.168.8.202:10110) $IIHDG,176.7,,,15.0,W*03<0x0D><0x0A>
<GREEN>09:40:51 (TCP:192.168.8.175:39150) $AIHDG,191.9,,,15.1,W*0D<0x0D><0x0A>
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Old 06-08-2023, 07:08   #12
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Re: Ignore sentences when priority source is available
Would nmeaconverter help?
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Old 06-08-2023, 07:14   #13
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Re: Ignore sentences when priority source is available
Here are two photos taken about a second apart.

You can see the radar interface bouncing between the two heading sources.

Click image for larger version Name: IMG_1845.jpg Views: 46 Size: 427.1 KB ID: 279232
Click image for larger version Name: IMG_1844.jpg Views: 40 Size: 429.4 KB ID: 279233
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Old 06-08-2023, 08:47   #14
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Re: Ignore sentences when priority source is available
caryiii...
message HDG shall contain a magnetic heading and if available info about deviation and variation. See here for info.
It seems Vesper is reporting a heading adjusted by variation i.e. true heading. That's not correct as I see it.
I'd suggest you filter out HDG from the Vesper - 192.168.8.175 connection. (For anchor watch you'd not need a heading?)
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Old 06-08-2023, 09:00   #15
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Re: Ignore sentences when priority source is available
Quote:
Originally Posted by Hakan View Post
caryiii...
message HDG shall contain a magnetic heading and if available info about deviation and variation. See here for info.
It seems Vesper is reporting a heading adjusted by variation i.e. true heading. That's not correct as I see it.
I'd suggest you filter out HDG from the Vesper - 192.168.8.175 connection. (For anchor watch you'd not need a heading?)

I submitted a ticket with Vesper and will filter it in OpenCPN. I do wonder why the radar plug-in picks it up though.

Thank you for the help!
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