Could be a useful in-car/portable unit?
http://www.portagame.com/sony_psp.php/2004/05/20/p119

Without a touch screen it would be slow to enter place names but there is already an add on keyboard.
http://www.gameseek.co.uk/productdet...aqce6he5x223r/

I guess the proof of the pudding will be in the software.