this nuvus have same `` problem '' as my old one from 5-6 year ago . to the lay person it appear it can not charge and run at the same time -lrb- ie : plug it in for charge-up and it stop mapping -rrb- . turn out it can sense specifically where it be get it be 12 vdc . if it be from a REAL usb port -lrb- like on a laptop -rrb- , it shut down however if its from another 12 vdc source through the supply usb cable it be ok . I 'll bet my old one have the same issue but Garmin only tell I the shutdown be not normal and\/or I must be mistaken !