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  1. 21st February 2013, 12:27 AM #1
    rfb
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    Quote Originally Posted by catymag View Post
    Rodrigo do you have a similar thread on Nimrag forum? If yes what do other brazilian friends say ? Many users have bad accuracy?
    It should be nice to share their results if you can report them
    Hi,

    I think most people that converted their units do not realize that issue in my forum...lolol

    But I put a notification about this issue and a link for this forum.

    But I know that another big brazilian forum have some users working together with us.

    They are watching here...

    []'s
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  2. 21st February 2013, 09:19 AM #2
    dasilvarsa
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    @rfb
    What files do you have in /.System/GPS folder ?
    The difference between stupidity and genius is that genius has its limits.
    Albert Einstein.
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  3. 21st February 2013, 11:12 AM #3
    lolypop000
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    Finally, i can sleep better at night

    So then some file on nuvi (from old 37xx) create mess with satellite accuracy and when you delite all, after this is better accuracy.
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  4. 21st February 2013, 12:23 PM #4
    isg
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    Let me add my 50 cents to the issue again . I have followed the instructions, even make some more tests.
    All I can say for now is that with that procedure accuracy of 3790 is in average 4 meters better than 3490 converted. I'm talking just for driving tests.
    Standing still with clear sky view - no difference. Need more tests, but still they are not same.
    What I have done description will follow soon, I hope .
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  5. 21st February 2013, 12:32 PM #5
    dasilvarsa
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    Can 3490 still boot if we delete all files ?
    1300 Can !
    The difference between stupidity and genius is that genius has its limits.
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  6. 21st February 2013, 01:35 PM #6
    Kanopus
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    I have decided to make some more serious test. I have put my nuvi 37xx/34xx next to other reference device and logged satellite signal over about 20 minutes at each test. Then I have averaged signal value form logs. Here are results, blue is 34xx/37xx signal, red is reference:

    My nuvi converted some times ago to 34xx, firmware 7.60
    [Only registered and activated users can see links. ]

    Nuvi converted back to 37xx firmware 3.60
    [Only registered and activated users can see links. ]

    Nuvi 37xx updated to firmware 5.00
    [Only registered and activated users can see links. ]

    Nuvi converted again to 34xx 7.60
    [Only registered and activated users can see links. ]

    I would say, that reception is better with firmware for 34xx.
    Last edited by Kanopus; 21st February 2013 at 01:37 PM.
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  7. 21st February 2013, 04:02 PM #7
    angelozip
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    Quote Originally Posted by Kanopus View Post
    I have decided to make some more serious test. I have put my nuvi 37xx/34xx next to other reference device and logged satellite signal over about 20 minutes at each test. Then I have averaged signal value form logs. Here are results, blue is 34xx/37xx signal, red is reference... I would say, that reception is better with firmware for 34xx.
    Hi Kanupus,
    Which software you has used to generate comparative charts and in what situation? The two gps were connected to the computer and management software at the same time?
    tks



    If you do a drive test, why don't you register a log?
    There exist diagnostic log, start logging in gpx format and then you would be able to analyze real precision of GPS.

    I agree that this procedure is very important to consider, as well indicated by the X-trail, but for it to be really reliable a reference is necessary, i.e, another GPS side by side, preferably a 3790 original.
    Last edited by angelozip; 21st February 2013 at 09:39 PM.
    DriveLuxe50, Nuvi 2689, Etrex 30x, Epix, VivoActive HR.
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  8. 21st February 2013, 04:48 PM #8
    Kanopus
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    Quote Originally Posted by angelozip View Post
    Which software you has used to generate comparative charts and in what situation?
    I have used LibreOffice for charts

    Seriously: on satellite window long press "Hight" filed and you will find GPS SNR logging window. There you can start logging, in menu "Start CN0 log". At each 10 seconds GPS writes satellite status to a CSV log in \Logs\snr\ or \.System\Logs\snr\. I simple got a good satellite fix at both GPS, put them near window and started logging for 20 minutes.
    Last edited by Kanopus; 21st February 2013 at 05:17 PM.
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  9. 21st February 2013, 01:55 PM #9
    dasilvarsa
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    @ Kanopus, Your's is working fine.
    Not all converted Nuvi's show the "problem"
    Only a few.
    The difference between stupidity and genius is that genius has its limits.
    Albert Einstein.
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  10. 21st February 2013, 02:25 PM #10
    Kanopus
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    Actually I'm not satisfied with my nuvi performance. But I think it is hardware problem. Newer firmwares seems to be a bit better but there is nothing, that can overcome old hardware design.
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