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Re: Coordinates of AIS targets
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From: |
Gary E. Miller |
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Subject: |
Re: Coordinates of AIS targets |
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Date: |
Sun, 7 May 2023 12:29:38 -0700 |
Yo Владимир!
On Sun, 7 May 2023 13:45:32 +0300
Владимир Калачихин <v.kalachikhin@gmail.com> wrote:
> I develop of AIS flow simulator. It's generally works,
Cool. What version of gpsd? There have been a few recent changes to the
gpsd handling of AIS.
> but:
> the OpenCPN and SignalK understands my AIS sentences and display
> targets in correct coordinates, but gpsd not.
Odd, I'd need to see your raw AIS to make a gues.
> Obviously, I am not creating AIS sentences in accordance with the
> specification that the gpsd follows when parsing sentences.
Not so obvious, could also be a gpsd bug.
> Which specification exactly does the gpsd follow? url?
From the file gpsd/gpsd_json.c. starting at line 2377:
* AIS defined in ITU-R M1371-5 (2014)
*
* https://www.navcen.uscg.gov/ais-class-a-reports
* https://www.navcen.uscg.gov/ais-class-b-reports
If you look, you can find the standard ITU-R M1371-5 online in various
languanges.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588
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