My data is several years old and really out dated. I've never bought updated maps, because for the most part, the old maps work fine (although the outdated info does occasionally bite me in the butt). At the time, new maps costs more than a new GPS unit.
Garmin introduced a program called RoadTrip as a Mac version of Mapsource a number of years ago. Just looked on their site and it doesn't appear to be available anymore, which is no loss because it was slow, buggy and hasn't been updated for a few years.Garmin now maintains Basecamp on both MacOS and Windows:http://www.garmin.com/us/products/onthetrail/basecampThis is what you want to use today on your Mac. Mapsource development has been discontinued and I think we will see it slowly fade away.
Yes, on your model it will display the name of the map that is embedded in the file by the author. The Montana shows this name as well as the name of the file itself. Maybe Garmin will update the Dakota firmware eventually to add this feature?If this really bothers you though, you can use GMTK to change the internal map name. This program also has some other handy utility functions: http://www.javawa.nl/gmtk_en.html
I had one map that kept showing up twice. Not sure why but when I reloaded the maps with the large one last it went away.
Here's a trick to getting MapSource, and it works! Best part is, it's right from Garmin with no hacks or cracks.Download the Training Center:http://www8.garmin.com/support/download_details.jsp?id=835Install itThen download the MapSource update:http://www8.garmin.com/support/download_details.jsp?id=209Install it.You now have full blown MapSource, enjoy!