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Of course a master reset is something else you could try. This should happen automatically with each bootup, but I have seen cases where it doesn't happen for some unknown reason.
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If you are certain there is only one file, you could delete GarminDevice.xml, then do a full power reset (hold the power button until you get the Shutdown prompt) to force a full rebuild of GarminDevice.xml. Be sure to check your SD card (if you have one) as well as the internal memory. In addition to an orphaned gmap3d.img file make sure you don't have any orphaned gmap3d.gma or gmap3d.unl files somewhere.
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It might give you some kind of hint as to why the device "thinks" there are 2 files. You should find a section like the following near the bottom of the file. You could browse through the \Garmin\GarminDevice.xml file to see if the gmap3d.img file is listed twice. Report back as we'd like to learn what you. When connected to your PC, can you tell us the amount of free space in your 3597 and whether you've deleted any voices or other files to give the device more storage or added extra voices, etc? If so, for heaven's sake, be sure to have a full backup of your nuvi before starting the tinkering. If ghost files remain from previous use of GarminMapUpdater, you may need to do some investigating of the 3597's file contents to remove the ghost files. The best solution is to use Garmin Express in the future to update a 3597. img files in the entire nuvi storage as well as any SD card if one is present. system folder as well so I suggest you search for all. If the 'D' file is there, you could try disabling it to see if your duplicate offering in myMaps disappears. img file of exactly the size of your gmap3D.img file which is named something along the lines of Dxxxxxxx.img.
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img files and see if you have a suspicious. I don't have an answer for why you're seeing the 3D map listed twice with only one gmap3D.img file. Using GarminMapUpdater rather than Garmin Express has multiple issues updating devices that offer DEM or 3D maps: If using Garmin Express to update a nuvi 3597, your offerings in myMaps will (or at least should) be: I would appreciate any advice on this issue. Why the map selection on the 3597 is showing two selectable 3D maps ?
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When I plug the 3597 to the PC and open the system's folder there is only one "gmap3d.img" file listed, with 234,976 MB. The CN North America NT 2017.30 3D is shown twice on this selectable map list. When I go to Setting > My Maps, I see the installed maps on the internal memory of the 3597, with the check mark selection next to them. I have successfuly updated the CN NA maps to 2017.30 on my nuvi 3597 LMTHD, using Garmin Mapupdater.