I have a new C340 Streetpilot. I have been able to create a lot of personal POI's, some with proximity alerts. I would like to be able to play a short MP3 file at some POIs by using the Tourguide file concept. Do I have to use Mapsource to do this or is there a way to do it manually? Also, do the Tourguide POIs have to be GPX files or can they be CSV files?
Finally, how can I access an SD card in the card slot on the 340?