2012.20 JCV file size confusion

So last night, I was able to get the Junction views to appear using the microSD card by doing a hard reset. But when I tried to use my nuvi today, the Junction views weren't appearing again, so I did another reset. To check, after getting the views to appear again, I powered off the nuvi and turned it back on to find that the Junction Views were not appearing again. If I have to do a hard reset everytime I use my nuvi in order to get the junction views to appear, then I might as well just put the jcv file back on the internal memory. Is anybody else experiencing this problem?

Something doesn't seem right rame1012. I do not have to reset my 755 to get the JCV to show. Do you have anything else on the SD? I know one time I had some odd problems when I had a corrupted MP3 file on my SD card. I was seeing map errors, very sluggish operation and other issues that weren't related to MP3, but I think the corrupt file was overwhelming the nuvi processor. As a test, you might try putting the JCV file on a clean SD card with nothing else on it.

This 4 gb mircoSD card is brand new, with nothing else being on it. I'm confused as to why I would have to reset it in order to get it to show every time.

if the JCV file is in internal memory? Did you format the SD card before you used it? If not, you might want to try a format of the card (FAT32, not NTFS) and recopy the file. It probably won't help but is worth a try.

I was able to download the full JCV file to my 765t perfectly! I too was caught up in the small JCV file size, even though I had plenty of room to spare. Sorry that I was too late in the thread to participate in the e-mail volly with the VP's and such.

EDIT: As a side note....

I am wondering if it really would be a copyright violation or not to share what they promised to give us, especially when THEY were the ones that broke the update process, telling us after the fact that we cannot have anymore what they promised us.

I personally didnt have the full JCV file to share, or I would have gladly. I was actually looking for someone that was willing to share it before finding the post with the download link from Garmin in it.

I am not advocating piracy, and I will disagree strongly that this case would be any form of piracy because everyone here is very careful to OWN either a legitimate lifetime map subscription, or at least a legitimate one time update purchase. This is about the straightest and honorable bunch I have come across, and should be commended for it.

It just isnt like we would be asking for something we didnt pay for....instead being caught in an end of life wind-down of our still very capable GPS units, and not allowing ourselves to be pushed into a new unit with some of our favorite features no longer available.

Just my 2 cents...

This problem does not happen when the JCV file is on the internal memory. And I've already formatted the card to FAT 32. I did that first before I did anything else.

FWIW, I'm running the 750+ MB JV file from the microSD card on my 3790T with zero issues. I'm seeing JVs where I have never, ever seen them before. Previously here in SoCal, they were on the freeway junctions only but now I see them on pretty much every off-ramp and these are photo-real JVs that actually look like the actual off-ramp. Pretty impressive but given the immense file size, I can now see where the size comes from.

Ah, but you failed to mention was that they are all full screen views and not the split screen views that you get when using the correct 3790 JV file. Note this is in Landscape Mode. Split screen views are available in Portrait mode.

Also when using the full screen views the actual view picture doesn't stay on the screen until you reach the turn/maneuver shown, like it does in split screen mode.

There are a ton more of them in places where I've never seen views before though.

Best place for tech support too it seems. Nice there is such a good relationship with Garmin.
Thanks again.

I was able to simply make a directory \Garmin\JCV on an old 1G flash card, and it worked with without a reset... I just powered on and it worked. I wonder if you have an issue with the 'slot' on your GPS. Try putting an MP3 on your card along with the JCV. when it gets into the mode where it 'forgets' the junction view, can you play the MP3? Or better yet, do you see two drives when you plug it into your computer?

Another thing to beware of is the large amount of fake flash memory sold on Ebay. Google the term 'sosfakeflash', it's an eye opener (and yes, I was burned for some fake memory). Some of the fakes are so good, they even have professional packaging with names like Sandisk, Kingston and Sony. A 4G memory 'looks' like it's all there to Windows, but strange things begin to happen when you get over 500M

An easy and free way to test flash memory is the program H2TESTW. You'll not only know if your memory is good, you'll know the read and write speeds.

Hope that helps,

Larry

I can confirm all that you've said (including, sadly, the too-good-to-be-true eBay purchase from an Asian seller, h2testw counterfeit test, etc.)

Even thought it'll cost folks, my suggestion is to run off to Walmart (camera or cell phone dept.) or RadioShack and buy a Sandisk Class 4 micro SD card and try the jcv file on this card. On some devices (like running Android from a SD card on a nook color ereader) faster class cards work more poorly than Sandisk Class 4s do.)

What brand and what Class is your card? Where did you buy it?

It's a 4gb Sandisk microSD card that I bought at Walmart for about 11 dollars.

I have a 3760LMT with the 750 MB JCV file on the unit.

Yesterday on a day trip while approaching interstate exits, I tried tapping the LA display as soon as the JCV went off. Each time the JCV came back on and stayed on until I was well on to the exit ramp.

I don't know if it is speed related or not. I was going 70mph when it would first come on. By the time it came on the second time, I was already slowing for the exit. JCV stayed on 15-20 seconds vs. the normal 8-10 seconds.

I am going to Atlanta, GA this weekend and will try this procedure on some junctions where you proceed on thru the junction without exiting to see if it will stay on until the junction is cleared.

This is a bit of a long shot, but one possibility may come from the fact that the original SD spec had a hard limit at 2 Gigabytes. That seemed a lot when the spec was made, but some chaos ensued when capacities crept up to the cliff. For a little while there was more than one workaround, with questionable cross-compatibility, but eventually the SDHC (High Capacity) scheme got very widespread, and I think most new sockets will handle both SDHC cards and original true-blue SD cards fine. But somewhat older sockets and firmware can have trouble, and even SDHC sockets can come on a device with firmware that just does not handle memory above some limit properly.

So, I suggest in the spirit of data collection that folks posting here with success or failure on SD cards holding Junction View files mention their GPS model, the manufacturer, model name, and capacity of their SD card, along with their success and failure.

Meanwhile, I think the most conservative thing to do is to use 2Gigabyte SD cards, at least in applications where the need for more capacity seems not likely or the price very, very cheap.

for the party line on SDHC, and SDXC (!), see:

https://www.sdcard.org/consumers/cards

rame,

I don't know if this will help but I use a sandisk 4gig in my 755 and ran across a problem in the 755. I use a variety of cards and have never had an issue with any of them. But.....

I have NA 2012.2, it's JCV, 3d bldgs all installed internally and I have a EU 2012.2 custom mapset with it's JCV and 3d bldgs installed on MicroSD (with adapter) and found that if I have both maps enabled in MapInfo at the same time, JCV works hit or miss, If if I enable only on map at a time the JCV's display as they should. I think its a 755 bug it works if I select only the map i'm interested in.

Also... I have used 2,4,8,16gig SD and 2,4 gig MicroSD from various vendors and speeds. I routinely have class-10 8gig SD in a 750 and 755 and have experienced no card issues.

This might help. Per Garmin's website:

Unit Series -- Maximum Size of SD Card

nuvi series -- 16GB
zumo 400 and 500 -- 4GB
zumo 220 and 600 -- 16GB
dezl series -- 16GB
StreetPilot c500 -- 4GB
StreetPilot c300* -- 2GB
StreetPilot i-Series* -- 2GB
StreetPilot 7200 / 7500 -- 2GB

*Note: StreetPilot c300 and i-Series units do not currently support the SDHC (High Capacity) cards.

*Note: All devices that support SDHC (High Capacity) cards will support up to class 10 cards.

Garmin website link: https://support.garmin.com/support/searchSupport/case.faces?caseId={a43e2650-1794-11e0-7efa-000000000000}

Have downloaded the subject 750 MB file directly to my nuvi 765T. Have about 1 GB free space left.

Have run simulation on my common routes and noticed the full junction views for on-route highway interchanges and exit ramps, many more junction views than before.

I got a 4GB SDHC from Walmart and put the 358MB JCV file from the 2012 DVD on it. Renamed the existing JCV to XXX. Popped the microSD in my 1490, and it works like a charm. A route that had 0 junctions now has 3 and they seem photorealistic.

I have the same problem with my zumo 660 not always seeing the micro SD card. I moved my Custom POIs to internal memory because I got tired of doing the softboot on the zumo (while its on, pressing and holding the ON/OFF switch for about 10 seconds) to make them re-appear. Just turning it off and on won't make them re-appear. It happens on multiple different cards, 2 of which were Sandisks from RadioShack.

I did mine and I just keep checking to see if I can still see the jpeg files for now.

What folder did you put the file in on the SD card for your 3790?

I just added the large jcv file, but I also have two earlier/smaller jcv files on my nuvi. Is it safe to delete them?

Just move them to your computer. If everything works OK with your Nuvi then you could delete them at some point.

As with you, I too have seen many more junction views during simulation than before, even pre 2012.20 update. Thanks again for being the one to go after Garmin on this and succeed!!!

I really don't want to update my map, but I'm so frustrated with getting the message that I should consider updating every time I turn it on. I hope it' not too big of a hassle. I get worried having an older unit, that things are going to start being less and less user-friendly and easy to do on my own as time goes on.

I too have a 3790T and did download the bigger file but which way to go I am unsure. Which gives the best view and which gives the proper duration of view for an old geezer with poor eyesight. If the bigger file is the way to go how to do it exactly? Thanks in advance.

For "old Geezer" eyes your probably best to run the 3790 in Landscape mode to see the JV pictures the easiest. In Landscape mode they take up the whole screen and cover up the map screen while being displayed. That could be a downside but it does provide the best view of the view, so to speak.

In Portrait mode you see a much smaller view picture in just the top half of the long narrow screen. In the bottom half of the screen you see the map screen displayed. So you get both the view and the map in this mode but they both only show on half the screen which maybe to small for you. Split screen portrait mode views do remain on the screen longer than full screen landscape mode views.

My suggestion, install the file and try each way and decide which is best for you.

No matter how you view the JV's you need to install the large file you downloaded to the \.system\JCV folder on the Nuvi or the \Garmin\JCV folder on a micro SD card that you would insert in the Nuvi.

In either case, rename the exiting JCV file in \.system\JCV folder or move it to your computer to use the new larger file.

You will need to alter Folder View Options in Windows to display all hidden files and folders and to display hidden system files in order to see and work with the .system folder on the Nuvi.

Thanks you for the help. If any of you see a mummy driving down the road with a big magnifying glass held out in front of him just leave a little space just in case and you all should be all right.

One last thing. Can anyone figure out how to make the full screen landscape views last longer like through or to the junction?

When I'm driving, if the Junction View goes away and I need to see it again.... I press the top 'bar' on the screen where it says 'exit next left'... Then press 'lane assist' at the bottom. The image will stay on the screen until you hit 'back'.

Larry

As t923347 says press the top banner. I then see all of my upcoming turns. I have to press the next turn on top of the list. From this screen if the turn has a Junction View available the Lane Assist button will be highlighted so you can press it. Though you press Lane Assist it does show the Junction View.

The 2012 line of Garmin's actually states that there are over 60,000 junction and interchanges for junction view. If they ever decide to cut down the file size in the future, we have something to base it on. Now we'll just need volunteers to count them.

From Garmin's website:

"Each 2405/2505 series nüvi also comes with our exclusive Garmin split-screen photoReal™ junction view that realistically display more than 60,000 junctions and interchanges on your route with photographic detail to clearly mark the correct lane to be in for complicated highway interchanges"

http://www8.garmin.com/move/

I have an 855 and 3790LMT .I don't care much for split screen JV. If I wanted to look at a small screen I would of kept my 350.

My new 2350 had a 105,775 KB jcv file and on updating to map 2010.20, it has a second 156,091 KB file in the same folder.

Apparently the "Full" jcv file for 2010.20 is a 770,511 KB file.

Should I remove both my small er files and copy the large one over? I do have free space as 2350 disk capacity shows 3.62 GB

Here's a posting I did earlier when using the 752 MB JCV file. When the map upgrade occured, the old JCV file should have been removed and you should only be using 1 JCV file, if you want to test the JCV file, rename the current JCV file, (.oldJCV), this will disable them and install the full version JCV and test.

I have a 2350LMT using the 37xx JCV file (446 MB)and everything works great and has the split screen. I installed the D306003A.JCV (752 MB) file and now the split screen no longer appears, just the junction view appears for a few moments and then back to the map. I compared junction view images from a few routes, the same number of junction views appear between the 2 JCV files on my test routes. I reverted back to the 37xx JCV file (446 MB), I perfer to look at the split screen, showing map and the junction view image at the same time.

Just replaced the file with the one downloaded from Garmin, working fine.

765T

I'd love to use the split screen feature. Do you have a link for downloading the 446 MB split screen file?

Since the splitscreen JV also keeps showing the live driving directions, I wonder if someone has figured out how to keep the JV display for a longer time.

Here's another one of my postings. I don't know the website I got my JCV file from, I did an internet search for D3191020A.JCV (457,055 KB)then found a download site for this file.

I removed the D3192020A.JCV (156,091 KB)from the Nuvi 2350LMT, installed D3191020A.JCV (457,055 KB), currently testing junction views and split screen is working correctly.

If your GPS doesn't support split screen, all you will see is the small 1/2 screen JV in the center of the screen with white bars on each side. You will not see the map information.

If you have enough memory on your unit, you would be better to load the larger file to get full screen JV's.

Which units have split screen?

They were added to the 37xx series by a firmware update. Can't speak for other models.

2460 has them.

Larry

Scott got the proper split screen on his 2350. I have the same model so I hope mine will also show the map info plus the JV.
Still trying to get the split screeen jcv !!

I read most of the comments. I have a zumo 550 and nuvi 3790lmt. The nuvi updated fine, the zumo had to delete gmapprom.img file and then was able to load a smaller section via the Garmin download page.
Also had a problem reinstalling poi's to the zumo and received info for the fix here. Told Garmin they wasted my time, wanted my money for a fix they wouldn't have done and said they should outsource their support dept.

I don't have a 2350, so I don't know if it has the split screen feature or not. If it has this feature when you purchased it, then it should continue to have it after you install the 446 MB JCV file.

If it didn't have split screen capabilities when purchased I am very surprised that Scott has reported split screen is working now. That was not my experience when using the JCV file from my 2460 (split screen device) with my 885T (not a split screen device). The file worked , but only gave me smaller images with white bars on each side.

But except for the JCV file, they have helped me with my 1490t problems.

My split screen works with the default JCV file on my 2350LMT, when I installed the full version JCV file,the D306003A.JCV (752 MB) file and now the split screen no longer appears, I installed the 37xx JCV file, split screen appears with added junction views over the default 2350LMT JCV file.

I can confirm now that the splitscreen feature does work on the 2350. The screen splits vertically, the live map moves over to the left half and the JV appears in the right half. I'd have preferred a horizontal split because this squishes the JV.

In the end I decided to go with the larger 750 MB full screen JCV file

I too just purchased a 2450LM which was updated to map v.2012.31 as soon as I plugged it in. Two days later got alert about 2012.20 ready to download and install. After reading about lost JV's from 2012.20 upgrade, I decided not to bother. Looks like an earlier version than what I have anyway. I didn't get any message about 2GB being too small for the upgrade I got. It went on smooth and works fine as far as I can tell, but I'd like to get a copy of the larger JCV file on a disk also.