newbie..you Can charge a GPS..order a Dahon Biologic Reecharge..know this though..the battery they use on the unit is 1600 Mah...you need a GPS with less then that or it won't charge right..I tried my Droid and it draws 1490 and it wouldn't charge except if you were going above 12 MPH,which is hard to maintain...need a GPS about 1000 Mah or less..lucky they are easy to find..you can charge your phone too but the same thing applies with the power...