The problem is that the RoadMate 1200 can't use it's maps on a generic card, and they are stored on a pre-loaded, protects 1GB card. There isn't enough space left on the card to add the larger POI database, and you can't move the maps to a different card because of the protection.
There isn't enough internal memory (only 64MB with 30MB free) to use the maps internally, either.
As far as the method for using the POI db on the 3100 series, that's different because you can apparently move stuff around and the main map data is stored internally.
At this point, I'd be content to be able to load my own POI data, and customize the existing databases. At least with that, I could load a big subset for the areas that interest me (i.e. a big database for southern California when I travel to San Diego).
The best solution is if I can get Magellan to give me the POI database details so I can create a nice tool for RoadMate users to do exactly that.
Since somebody on this forum pulled the metadata from the database, I assume there are tools for compiling and decompiling the data from the POI format. If somebody could help me with that, I'd love to put something together for everybody here (I'm a software engineer with 25 years experience, with extensive Windows CE experience, as well). TimeKeeper appears to have merged two databases, too, so the tools must be out there... as long as I can utilize them, or at least create files that can be used by them, we can open up all of the wonderful POI databases that are available.