I just found this thread and I too am disgusted that I can't download maps to an SD card for use on the BB. With the data requirement, I can't be on the phone and use GPS at the same time. I had Mapopolis for my Palm and the whole US fit onto a 1 GB SD card with plenty of room to spare. Granted, these were simple maps with limited POIs, but the goal is navigation here - have the roads on the SD card and leave POIs to be obtained through data service, to keep it up-to-date. But, for point-to-point navigation, no reason I should need data services.