Welcome guest, is this your first visit? Click the "Create Account" button now to join.
Page 24 of 40 FirstFirst ... 14222324252634 ... LastLast
Results 231 to 240 of 397
  1. #231
    GPSPower Helper


    Join Date
    Apr 2011
    Posts
    302
    Rep Power
    294

    Default

    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 21:39.
    Nuvi 2689; 3490; Etrex 30; Oregon 200 (from Approach S5)

  2.    Advertissements


  3. #232
    Master
    giuseppe66's Avatar
    Join Date
    Apr 2010
    Location
    on earth
    Posts
    208
    Rep Power
    127

    Default

    Quote Originally Posted by Kanopus View Post
    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.

    Ok, sorry, just i have i post

    @Rfb, if you have, can post for me this file? i can't today..thanks
    Last edited by giuseppe66; 21st February 2013 at 16:34.

  4. #233
    Navigation software expert Kanopus's Avatar
    Join Date
    Jan 2010
    Location
    Internet
    Posts
    481
    Rep Power
    249

    Default

    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 17:17.
    Thanks, Kanopus

  5. #234
    Member +
    Join Date
    Nov 2009
    Location
    Brazil
    Age
    39
    Posts
    53
    Rep Power
    25

    Default

    Quote Originally Posted by rfb View Post
    Hi People!

    I'm just installed according the Tutorial from giuseppe66.

    The preliminary news is...............................GOOD!
    In stationary posistion the accuracy was so much better. The signal power looks better as well.

    The image below shows the satelite page with GPS from my windows home. Weather with some clouds.

    With 37XX/34XX after Tutorial:
    [Only registered and activated users can see links. ]


    37XX/34XX before Tutorial:
    [Only registered and activated users can see links. ]


    Original 37XX:
    [Only registered and activated users can see links. ]

    Tomorrow I'll be back with the news about normal use on the road with GPS.

    []'s

    Hi people,

    False alarm, unfortunately....

    Yesterday, the accuracy was wonderful, but driving was terrible.

    I drive today with GPS all the time on Satelite page, and with the car parked looks good, with 5-7 meters.
    But when the car start to move, these good values goes up until 17 meters.

    Below, a screenshot driving:
    [Only registered and activated users can see links. ]

    So, not worked perfect to me. Yes, looks a little better, but not like original 37XX.

    Are there more people that can test the giuseppe66 tutorial?

    []'s

  6. #235
    VIP Master
    isg's Avatar
    Join Date
    Jun 2009
    Location
    Europe
    Posts
    170
    Rep Power
    81

    Default

    I already did that. Results more or less similar to yours.

  7. #236
    Master
    giuseppe66's Avatar
    Join Date
    Apr 2010
    Location
    on earth
    Posts
    208
    Rep Power
    127

    Default

    [Only registered and activated users can see links. ]
    This is my log's file. Today i've drive in city (not highs buildings) and today there are clouds. Of course accuracy is not like original 3790 but more better then first (convert directly with firmware 7.10) for me
    Last edited by giuseppe66; 22nd February 2013 at 15:17.

  8. #237
    VIP Master
    isg's Avatar
    Join Date
    Jun 2009
    Location
    Europe
    Posts
    170
    Rep Power
    81

    Default

    I have 3790 ->3490 model. Definitely I had accuracy problems and I was happy with new user friendly Garmin software, but in the end of the day I need a reliable and with good accuracy GPS unit. And that is all that matters for me. I knew that many people have that kind of problems, which did not make me happy. One of my friends gave up and went back to 3790 because of the accuracy. I’m not giving up so easy, but without all the participants in the thread I will not be so resistant to the frustration and will to go back to 3790 SW too. In one of my resent trips I have recorded accuracy – if someone is interested I can sent the excel file – but accuracy was awful – in average about + 20 m .

    In general the idea of Lolypop000 was do the following:

    1st - to reverse SW from 3490 back to 3790.
    2nd - to reverse again SW to 3490 not with the last SW available, but with much earlier one – in my case 3.50.
    Then to check did html folder [Only registered and activated users can see links. ] and if not to change them.
    I have started the procedure for accuracy improvement reading again [Only registered and activated users can see links. ].
    My sincere advice to any of you is to read it carefully, does not much matter how experienced in software updates you are. The devil always hides in the details , which are often well forgotten.
    Following the instructions I have made copy of the all GPS files to the computer, made copy of region 41, renamed the directories Voices, Text etc., downloaded [Only registered and activated users can see links. ], but it is up to you which to use.
    Transformation was successful. I did not put Garmin logo or change directories after 3490->3790 as I needed just accuracy page.
    The accuracy was better with 3790 SW. Standing at one place with “clear” sky I had 4 m. accuracy and most important, driving the car I had between 6 and 8 meter accuracy which was perfect.
    I have made some screenshots, but unfortunately they disappear in some of my Clear NV or Clear user data…. .
    In /.system/GPS/were 3 old files ARC.BIN, BEE.BIN and mt.nvm. In /.system/diag there was no html directory and supported_features file to be checked.
    So far, so good.
    It was time to go back to 3490 SW. I downloaded [Only registered and activated users can see links. ]. Next time I may try with even lower version and will see did that gives me better results.
    Cleared NV, removed GUPDATE if any, flashed the unit.
    OK – look like everything was in order. I did not touch dir names, or update something. Again I needed just accuracy.
    Accuracy was OK if we talk about standing in one place with a clear view to the sky. Good means good 3-4 meters. Driving tests with 3.50 SW were promising about 4 meters worse accuracy which was let’s say acceptable.
    In /.system/GPS/were 3 old files ARC.BIN, BEE.BIN and mt.nvm.
    In /.system/diag there was html directory and supported_features file. Both values /see these posts [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]/ were there and were correct. In my case – same part number and Rev: 0A
    I copied rnx folder with all subdirectories sent me by Lolypop000 3490 unit in /.System/GPS – it did not worked for me again. The software did not use them, so after second test I have removed them.
    Then I make next step – flashed unit with 3490 SW 7.10. No changes in satellite reception behavior and accuracy.
    In the end using myDashboard changed SW to last one 7.60. I have renamed back to normal names all directories, checked and downloaded what I have missed.

    Conclusions: Following this procedure you will improve your unit accuracy, but it will not be the same like 37xx one. More or less you will lose accuracy more easy, especially driving and you definitely will need more visible satellites in the sky compared to the number which original 37xx, 34xx or 2xxx will need. In the big cities or in the mountains, in real life the satellites are never enough.
    We should try something else.
    While waiting I’ll reverse my unit to 3790 and will go with lowest available 3490 SW version.
    I’m not expecting miracles but will try. If nothing appears until then, I will transfer the unit to 3790 and will stay with that SW for a one or two week, making some records of the accuracy /snr logs/. Hope that someone will figure out something, because the accuracy is still very important for me.
    Last edited by isg; 22nd February 2013 at 13:34.

  9. #238
    GPSPower Helper

    dasilvarsa's Avatar
    Join Date
    Feb 2011
    Location
    Global
    Posts
    1,160
    Rep Power
    351

    Default

    Maybe we've taken this to the other side.

    The question you have to ask yourself, Is the Converted Device Usable for street Navigation or Not ?

    Logic Tells Me.

    Device is usable for accurate street navigation > Keep it as 3490
    Device is not usable for accurate street navigation > Revert to 3790

    The Fact that it might show +- 10 meters Accuracy VS 4 Meters Accuracy might just be incidental to the different GPS Chipsets.
    The difference between stupidity and genius is that genius has its limits.
    Albert Einstein.

  10. #239
    Master
    giuseppe66's Avatar
    Join Date
    Apr 2010
    Location
    on earth
    Posts
    208
    Rep Power
    127

    Default

    Quote Originally Posted by dasilvarsa View Post
    Maybe we've taken this to the other side.

    The question you have to ask yourself, Is the Converted Device Usable for street Navigation or Not ?

    Logic Tells Me.

    Device is usable for accurate street navigation > Keep it as 3490
    Device is not usable for accurate street navigation > Revert to 3790

    The Fact that it might show +- 10 meters Accuracy VS 4 Meters Accuracy might just be incidental to the different GPS Chipsets.

    I think that accuracy is important for navigation but it's depending of personal use. Now, accuracy of my 37xx>34xx is more better then first so for me is good. I had problem (with bad accuracy) only in city with highs buildings when nuvi must often do recalculate of route. In city there are many streets very near so gps with bad accuracy don't undestrand where are you exactly and is impossible navigate so. Now that my accuracy is good for me i've not try nuvi in big city. i've decide keep my nuvi with 34xx firmware now because i use also android phone with smartlink and 37xx don't use. I think that another problem of bad accuracy is when we use pedestrian mode because is important in this mode that we have a good accuracy. So, i don't live in a big city and i don't go often in a big city, so for my personal use it's ok
    Last edited by giuseppe66; 22nd February 2013 at 15:15.

  11. #240
    VIP Master
    isg's Avatar
    Join Date
    Jun 2009
    Location
    Europe
    Posts
    170
    Rep Power
    81

    Default

    In my opinion - GPS and every other unit has been bought because it should cover my/yours high expectations in almost every city environment. If I wanted a mountain GPS or "some" GPS I would not buy 3790T or the best Garmin at that time. Less than year later, Garmin stopped 3790 and said "Sorry Guys".
    My only feeling was that I'm screwed up!
    So I will do whatever possible to get us much better accuracy as possible using new software. If not - most probably I'll go back to 3790 SW because of the accuracy.
    If during tests unit die - well next series are coming. I'll buy new best one. The problem here is that you never knew which unit is the best one.... Sometimes most expensive is not equal to the Best and reliable .

 

 
Page 24 of 40 FirstFirst ... 14222324252634 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.