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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?