I just recently bought my Nuvi 660 and looking for any POIs of interest. If there are POIs that are factory loaded, will adding third party POIs overwrite the factory POIs (if the factory CSV files are not present in the same folder as the third party items, when uploading?
They are two completely different things. The built in POIs cannot be adjusted, they are part of the Maps and will be changed when/if you update to the next version of Maps.
Note that when you do a search, you are only looking at the factory POIs. You need to go to your custom pois and do a separate search within that group to find a particular location that was loaded in Custom POIs.
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