Garmin GPS-24xd HVS 10 Updates Per Second Mode Update Problem

Discussion in 'Garmin GPS' started by pistolpete817, Nov 16, 2023.

  1. pistolpete817

    pistolpete817

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    I have used GPS-19X HVS units for many years at the 10 updates per second mode. I usually log GPRMC and PGRME.
    The UTC time field, the position field and all others change at .1 second intervals.

    I recently bought a GPS-24xd HVS for the improved accuracy ambiguity with the addition of L5. The accuracy improvement both static and moving was excellent. However, in the 10 updates per second mode, the time only changed every second. So, you get 10 position readings all with the same UTC time.

    I have contacted Garmin about this. They seemed surprised. But said that few people ever use it like this so it could go un-noticed. This seems like a pretty big over sight.

    Does anyone else have any experience using a Garmin GPS-24xd HVS in the 10 updates per second mode to navigate using NMEA sentences?
     
    pistolpete817, Nov 16, 2023
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  2. pistolpete817

    Nuvi-Nebie Moderator

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    I'm guessing that the 19X outputs NMEA sentences like this :-

    $GPRMC,123519.00,A,4807.038,N,01131.000,E,,,230394,,,A*6A

    where the seconds fraction is 00 to 90, does the 24XD also output these digits but they don't change or are these digits omitted all together?
     
    Nuvi-Nebie, Nov 17, 2023
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  3. pistolpete817

    pistolpete817

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    GPS-24xd HVS

    GPS-24xd HVS GPRMC.jpg

    GPS-19X HVS
    GPS-19X HVS GPRMC.jpg
     
    pistolpete817, Nov 18, 2023
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  4. pistolpete817

    Nuvi-Nebie Moderator

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    I don't know the details of NMEA sentence construction but I find it odd that almost every numerical field has a different number of digits in it, I would have thought it would be standardised, are they different NMEA versions I wonder

    compare.jpg
     
    Nuvi-Nebie, Nov 18, 2023
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  5. pistolpete817

    pistolpete817

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    The GPS-19X has a specification document that details the NMEA sentence structures. I have never found anything like that for the GPS-24xd. It is the most under documented device like this that Garmin has ever produced.
     
    pistolpete817, Nov 18, 2023
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  6. pistolpete817

    Nuvi-Nebie Moderator

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    I couldn't find the GPS 24 xd HVS TECHNICAL SPECIFICATIONS document either, it looks like the 19x uses NMEA183 and the 24xd has both NMEA 183 and NMEA 2000 versions but that doesn't explain the lack of 100ms info., I wonder if it needs to be 'turned on' using the configuration NMEA sentences but as the default output rate is10Hz then logically the 100ms info. should also default to on, as we don't have the 24 xd techical spec. It's difficult to move forward

    We need the 24 xd equivalent of this :-

    2023-11-18_18.09.47.jpg
     
    Nuvi-Nebie, Nov 18, 2023
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  7. pistolpete817

    pistolpete817

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    From Garmin Product Support

    Will the software update correct the problem on existing units?

    Yes, existing units will be fixed with the update.
    I'm not certain on the specifics, but it sounded like it could be an issue with the programming software.
    I'm betting both the software and the antenna will get an update.
    I hope we can track your races soon.
    Thank you for choosing Garmin,

    On 11/16/2023 1:26 PM, [email protected] wrote:
    Any update?

    It is very good of you to ask.
    I was going to email you today.
    I am happy to inform you that we reproduced the bug you reported and are implementing a fix in an upcoming software update expected in the first quarter of 2024.
    I hope that helps and you have a nice rest of your day.
    Thank you for choosing Garmin,
    Jayce
    Product Support
     
    pistolpete817, Nov 18, 2023
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