As you all have confirmed, it seems older and unlocked maps are loading onto these new Garmins (just got a Montana) but Maps with ids newer than 2200 get the Authenticate error. I tried using the app mentioned in this thread, "Unlock_Mapset.exe", and though you need to run it for each Mapsource product, it does appear to work! I ran a test with the City Navigator 2012.20 (For which I have a lifetime subscription) loading just two map segments, and they worked! Trying a larger set now. In addition, the new Garmin Bluechart G2 Vision chart works.