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I'm aware of this, which is why I said Garmin and Map folders as opposed to Garmin/Map. The xml file says gmapprom goes in Garmin and gmapsupp goes in Map.

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Post #1 doesn't explain what JCV files are or whether I need them. The XML file says it is a Lane Assist Template. I found one in the hidden .System folder. It doesn't appear to be related to my problem.

I put the maps in the root folder of another GPS as gmapprom and got the error "can't unlock maps". Aren't all the maps posted here unlocked?

What's the difference between NT & NTU?

Hello. Does anyone can help me with an issue with that model? It is quite old, right, but I want to use an OSM map on that device. I downloaded the map from one website, where was written that the maps there, are free. But when I copied that map on the device there is nothing on the screen. In Settings, I can see that map and it is checked, but is not visible. Also, I loaded that map in Garmin Base camp and it's shows me that the map has certain limitations. What are my options? Thanks.

1.

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2. In the memory card(8GB)
3. gmapsupp.img(it was different, but I renamed it)

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Hi Alesyz,

Did you just copy it at the root of the sd card or in a 'garmin' folder ?

@Jiggz
It very much depends on whether your device is an LM (Lifetime Maps) model or not. Most recent devices are but many older ones, particularly cheaper 'leader lines', are not.
Specifically for each case:

• If you have an LM model which saves the primary map as gmapprom.img then clearly don't replace it other than by regularly using the free updates via GarminExpress.
• If the device doesn't have an LM entitlement then certainly if you're going to use later unofficial (unlocked) maps of the same version you may remove the older primary pre-programed map along with any associated ancillary files from the device and replace it with the newer unlocked map and other files of the same series. However it's much better to have unlocked maps on an inserted media card rather than in the devices internal memory. Safer if anything goes wrong, remove the card and remove the problem. Regardless, never run two different versions of the same series map even with one de-selected in settings.