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Old 16-12-2017, 15:48   #1
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Question OpenCPN not recognizing my NMEA?

I've been using OpenCPN with my electronics for a number of years without issue. I've recently bought a new computer and installed the latest version of OpenCPN (Windows). I've configured my serial port connection and it is receiving the NMEA sentences that the electronics are sending, but OpenCPN seems to only recognize a few of the sentences that are being sent. I used to see GPS position information but not anymore. All I'm seeing are "True Heading" and "AIS". Attached is a screenshot of the NMEA debug window. I've marked the sentences OpenCPN recognizes in blue and those it doesn't in red. Am I doing something wrong?
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Old 16-12-2017, 16:59   #2
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Re: OpenCPN not recognizing my NMEA?

A lot of your data sentences are missing checksums.

The GPGLL sentences certainly are breaking the standard even more - After each NMEA0183 sentence there should be a DOS newline (aka <CR><LF> - character <0x0D> followed by character <0x0A>), but after GPGLL, the later is missing and the sentence comes concatenated with the GPRMC that always immediately follows it.
Any piece of hardware that might be suspicious of breaking it? If I remember correctly, if there were checksums in the GPGLL, OpenCPN's parser would recover from this error.

The DPT sentence is also not according to the standard - Besides the missing checksum, it should have only two data fields, not 3 (NMEA Revealed)

We could certainly implement workarounds for these issues in the OpenCPN NMEA parser, but it would be much better if you managed to fix your instruments to send correctly formatted data.
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Old 17-12-2017, 02:46   #3
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Re: OpenCPN not recognizing my NMEA?

We're using some custom electronics so I will pass this information along to the developer. Thanks!
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