This video is showing how easy it is to install TomTom GPS Navigation software from the micro SD expansion slot. The phone is running Windows Mobile 6.1 with the AT&T default software uninstalled.
Turn the phone ON with out the micro SD card inside. Download the TomTom software on your micro SD card then put it into your windows mobile phone. Insert the micro SD card into your AT&T Tilt. The TomTom should start to install automatically. Next pick the settings, please watch the video to see the settings.
TomTom GPS navigation software is very easy to use and I use it all the time. I have had no problems, it all runs great and I would buy the software again.
GPS on your cell phone like the Tilt has is invaluable to me and is a must have. You can try free maps from Google or Microsoft they work well to but I like the look of TomTom best.