none of the ITs are a gps. that said, GPS software is available, and maemo mapper is one of the better ones. the BT GPS device will allow to take advantage of the functionality in maemo mapper or other GPS software packages available.

maemo mapper will do the long+lat, route tracking, and waypointing your looking for. install the package and play with it a bit before you purchase the BT GPS. its free and you can get a feel for what it does. if it doesnt do what you want then you can go get the device that will do what you want without having paid for a BT GPS you dont want/need.