What Files supports my Garmin Device and which Files I should update?

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I've always named the folder Garmin. However, it doesn't work with some nuvis I've tried. I've never heard of naming the folder Map. Is that specific to a model or timeframe?

virgonomic Reviewed by virgonomic on 25th July 2020. What Files supports my Garmin Device and which Files I should update? What Files supports my Garmin Device and which Files I should update? Often, indeed almost always, on the occasion of the release of a release of Maps the Forum is overwhelmed with questions (and therefore of Post) of the type: My Nuvì xxxx supports JCV? If Yes, what type? Can I install in my Nuvì xxxx 3DBuilding Map? Where to copy Maps? In which folder? Rating: 5

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All Garmin Automotive Device, since 2013 manage folder \Map (either internal or external on SD) for storing additional IMGs.
Outside this folder only two Maps are recognized, gmapprom.img in folder \.System and gmapsupp.img in folder \Garmin
Outdoor Device use instead folder \Garmin (either internal or external on SD) for storing any additional .IMG Maps you want

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I've tried to update a few GPS' that didn't show the maps on an SD card. If the code for extermalpath does not appear in the xml file, what's the best way to add it? Should that solve the problem?

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It was a Garmin 265W. I no longer have it. The map was located at SDcard:\\Garmin\gmapsupp.img
This matched the location in the .xml file.