Like I said - the PDA displays are so small that you really need to use the whole thing. The empeg's display is about 3.25" (83 cm) across while a typical Palm is roughly 2 1/3" (6 cm) wide. So we would only be using 4/5th of that (128/160) or about 1.9" (4.8 cm). Picture the empeg's display on your dash but less than 2" wide (and on an LCD display). I don't know about you but I think that would be hard to use.