Let me specify one more time that any user with BlackBerry OS 4.2 and higher can use GPSed mobile application.

Those users who have BlackBerry OS 4.2 and higher can connect to any external GPS receiver via Bluetooth and record tracks from the BlackBerry.

Those who have 8130, 8310, 8800, or 8820 just don't need an external GPS receiver, because these models have a build-in GPS receiver.
It's just makes it easier to record the track : )