[Tmair]

I've used garmen on my Treo Centro, and on my HTC Touch, I never ran into a lag, it is spot on when I pass an intersection.
Also I don't know about the STP but on my Centro I could use the built in querty key board, so I would think you can use it with the STP but could be wrong, I know in the settings it asks if you have a built in keyboard.
Terry