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Hi I am new to this and I wondered if you can help me.

I downloaded map data from the next and have now a .img file on my harddisk.  How do i get this map data into roadtrip or basecamp?

I am on a mac and I don't have the garmin with me at the moment.  I only want to load the map data into roadtrip or basecamp and then later feed it into the garmin. Possible?