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  1. #1
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    pin nüvi 3790T general questions

    Hi there, I'm pretty new at getting maps onto my unit, but have done just the maps part (like gmapprom and gmapsupp files), so that much I understand.

    I am about to update my Nuvi 3790T with the most current NA maps, and had some questions about which JCV files I should be copying over to my unit's memory. Currently, the unit only has one JCV file in its directory, which is dated 2010.

    I see the new maps come with lots of JCV's. I'm wondering which ones I should copy over?

    1 - LaneAssistFull
    2 - LaneAssistMedium
    3 - Full-Screen
    4 - LaneAssistPortraitFull
    5 - Split-Screen
    6 - Nuvi-40,50-Android
    7 - PreProgrammedLaneAssistTemplatePortrait - nuvi 6x


    As well, I had a question about naming conventions for when you want to have multiple maps on your SD card. I want to put the most recent Europe maps on an SD card, and know that if it was just one IMG file, it would be easy. I'd just have to call it gmapsupp. But the maps seem to come in a few files, which are currently:

    gmapprom
    gmapprom_0
    gmapprom_1
    gmapprom_2

    Renaming the first one to gmapsupp gets it to appear, but it's just the Nordic maps. I've tried renaming the other files stuff like gmapsupp1 or gmapsupp_1, but the unit didn't recognize them. I've read in some links that on an SD card, it can only recognize one gmapsupp file. Is that correct, or is there a way to do it?

    If it's not possible to have all the maps show up in the unit, what do people do? Put all the files on the SD card, and when they want to use a different map, rename it gmapsupp, and rename the existing gmapsupp as something else?

    Thanks a lot.



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  3. #2
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    Read post n18 here:
    [Only registered and activated users can see links. ]
    and this:
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
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  4. #3
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    Default JCV and other files

    Hi, I'm a total noob at this, so please bare with me!

    I'm going to try to tackle each of my issues, one at a time. For the JCV files, the second link you posted helped a lot, and I managed to find where to put my JCV file. As far as which one my current Nuvi 3790 uses, a search of the XML file shows me only one instance, namely "PreProgrammedLaneAssistPortraitFull", which is not an exact match of any of the above 7 files that I have. I'll try to number my questions for ease of replying:

    1 - Is #4, LaneAssistPortraitFull, which is pretty close in name, but is missing the "PreProgrammed" part ok to use?
    2 - Or should I use another one?
    3 - Or none at all...
    4 - So am I understanding correctly that my GPS only uses one JCV file?

    5 - I've also got files for the Safety Cameras, which are GPI files, and have found where to put it, in the POI folder. Also, Safety Cameras show up in the XML file, so I'm guessing this should work. Anything else I need to know?

    6 - But what about SCDB files? For Speed Cameras. I've got the files, but when I search for a file extension SCDB or the word Speed in the XML file, nothing shows up. Does that mean my GPS doesn't support Speed Camera POI's?

    7 - After the above, I'll have the main stuff updated AFAI understand, such as my main map, my 3D map, Junction View, and maybe some of the camera stuff. Since I don't use my GPS daily, I might be content at this point, unless there's other really important things you think I should update. For traffic, I see Traffic Trends mentioned in relation to other files I have access to, like G2S and SQLite stuff, but I'm really new at understanding them. Do I need to update them too to get traffic updates, if I still use my original cable with the built in traffic receiver?

    8 - All the above relate to me updating my North America maps. I'm going to also update my Europe one, and the JCV files I found, there are only two to pick from: D3084180A (Full-Screen) and D2504210A (LaneAssistFull). Would either of these work with my GPS, even though they're not the PreProgrammedLaneAssistPortraitFull one I found in my XML?

    MUCHO GRACIAS!
    Last edited by Lotus99; 13th October 2016 at 07:48.

  5. #4
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    Default Putting multiple maps on an SD card

    The link explaining:

    In the MicroSD card, under the /Map directory, multiple maps with any filename can be used simultaneouslySo long the file extension is .img (eg MapOfMyCountry.img), the device will recognise the maps.

    Was perfect, thank you!

    Two questions:

    1 - I assume a 3D map could also be placed there?
    2 - What about JCV files? Can they be put on an SD card, and if so, where exactly? On the unit itself, they are in the JCV folder within the hidden .System one...

  6. #5
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    Quote Originally Posted by Lotus99 View Post
    ......
    Two questions:

    1 - I assume a 3D map could also be placed there?
    Yes, correct. I assume you mean a 3D Buildings and Landmarks map which also can go in the microSD's 'Garmin' folder as gmap3d.img. If you mean a 3D terrain [DEM] map, naming is gmapdem.img for sd's Garmin folder or in .System on unit.

    2 - What about JCV files? Can they be put on an SD card, and if so, where exactly? On the unit itself, they are in the JCV folder within the hidden .System one...
    In card use this path: x:\Garmin\JCV\*.jcv

    BTW, all this info is available in Tut threads in the [Only registered and activated users can see links. ], just search for the answers. Quicker than posting and waiting for answers and less trouble for you as well.
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  7. #6
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    Default

    Gotcha Neil, thanks. I've read the links caty had posted, but not every tutorial on the website yet.

    Did you get a chance to review post #3 also, above the one you replied to with my 8 questions?

    I didn't think all those questions would be easily found in the tutorials since they were a little more specific... Or at least without me spending a couple hours poking around, vs. someone who knows their stuff taking a few minutes I'm guessing to let me know the answers.

  8. #7
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    Quote Originally Posted by Lotus99 View Post

    8 - All the above relate to me updating my North America maps. I'm going to also update my Europe one, and the JCV files I found, there are only two to pick from: D3084180A (Full-Screen) and D2504210A (LaneAssistFull). Would either of these work with my GPS, even though they're not the PreProgrammedLaneAssistPortraitFull one I found in my XML?
    Load CNEU NTU preferably . You need LaneAssistPortraitFull D3048230A.jcv for NTU version.
    [Only registered and activated users can see links. ]

    5 - I've also got files for the Safety Cameras, which are GPI files, and have found where to put it, in the POI folder. Also, Safety Cameras show up in the XML file, so I'm guessing this should work.
    Correct. Use unlocked or encrypted files.

    6 - But what about SCDB files?
    Read in thread, you must use Poi Loader.

    I see Traffic Trends mentioned in relation to other files I have access to, like G2S and SQLite stuff, but I'm really new at understanding them
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  9. #8
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    Quote Originally Posted by Lotus99 View Post
    Gotcha Neil, thanks. I've read the links caty had posted, but not every tutorial on the website yet.

    Did you get a chance to review post #3 also, above the one you replied to with my 8 questions?
    Missed it sorry, only saw the following post. That's another reason we prefer ppl not to make consecutive posts, better to use the 'Edit Post' function.

    catymag's answer should now have you sorted with a bit of reading too on your part 'Give a man a fish ..... vs. Teach a man to fish .....'
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  10. #9
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    Thank you both. I've been trying to read up as much as I can, but as you can imagine, I'm not going to in a few days gain as much knowledge as you guys who have been here years...

    I'm pretty much set and have understood most things enough to take it from here with your tips and various links and tutorials. The tip on the POI loader for the Speed Cameras was much appreciated. I'll give that a shot.

    I'm just wondering if you can answer my very first question though on which JCV file to use for my NA map? I think I know, and I guess worst case, I can just try it and see if it works or not, but it would be nice to have confirmation first from the experts. To recap:

    For the CN North America NT 2017.20 ALL map, these are all the JCV's I have in my possession.

    1 - LaneAssistFull
    2 - LaneAssistMedium
    3 - Full-Screen
    4 - LaneAssistPortraitFull
    5 - Split-Screen
    6 - Nuvi-40,50-Android
    7 - PreProgrammedLaneAssistTemplatePortrait - nuvi 6x

    My current Nuvi 3790 uses, from a search of its XML file, the "PreProgrammedLaneAssistPortraitFull" JCV, which is not an exact match of any of the 7 files that I have.

    1 - Is #4, LaneAssistPortraitFull, which is pretty close in name, but is missing the "PreProgrammed" part ok to use?
    2 - Or should I use another one?
    3 - Or none at all...
    4 - So am I understanding correctly that my GPS only uses one JCV file?
    Last edited by Lotus99; 14th October 2016 at 07:10.

  11. #10
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    Your 3790 natively uses #4, for the current 2017.30 NA map that's D3191210A.jcv which is the split-screen type of 212x234pixel picture size. If you want to display in full-screen you can use any of the 3 available 480x270pixel picture size files.

    [Only registered and activated users can see links. ] [Only registered and activated users can see links. ]

    You should only load ONE JCV file for each map however, do not load both the split-screen and full-screen files, choose one only. You may of course have other JCV files for other maps, i.e. as you intend to have both maps loaded, you can have one jcv file for EU as well as one jcv file for NA.
    'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
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