AGPS (assisted GPS I believe) means you have to contact someone for the phone to get triangulated data on its location. Telenave I believe is the service sprint sells on a monthly basis for that service. Potentially AGPS could do this without monthly service fees but not currently as they are difficult to access and most units with them don't support java from what I've been told.

TomTom, Iguidance and others are software that run on your phone should it have a full GPS or link to a full GPS that maps and navigates for you. MS live and other apps that are small and free do the same thing but without some of those functions.

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