"Trackpad navigation" refers to using a touch-sensitive surface (trackpad) on a device, such as a laptop or smartphone, to control and move the cursor or navigate through different options or pages on the screen. Full definition
The new BlackBerry Torch 9810 (GSM) builds on the original BlackBerry Torch 9800 (GSM), carrying a full touchscreen and trackpad navigation as well as a slide out QWERTY keyboard. (crackberry.com)
As you all know this one is making the switch as well as it has the new optical trackpad navigation. (pocketberry.com)