Go buy a small GPS unit and mount it on your handlebar and enjoy the ride. On my Merlin I have a Polar 720i with all the bells and whistles and it's awesome, but on my NorWester Tour, I have a Garmin HCx Vista and I'm cool with that. Enjoy the tour!Different strokes, but I'd rather not use something that battery hungry. It would take about 60 AA batteries (give or take) to do the Trans America. My Cateye still has the original batteries in it after 3 years including the TA and two other fairly major tours.
Hahaa! Not if you have one of these bad buys eWerk by Busch & Mueller mounted on your bike.
... but you're right, they [GPS] will go through some batteries!