I received a good price on this new 4year old unit. Had the unit installed along with a USB port installed in the center console along with a backup camera.... Being 4 y/o unit the maps are out of date so I'm having trouble deciding how big of a USB stick to buy to down load the maps from Garmin as I don't know how much is enough. As I'm not knowledgeable in what size I was wondering if maybe 64gb would be sufficient. Believe me any help would be appreciated......(Don't know what a gig-a-bite is).....Bruce L. Hansen......Senior Citizen.....Alive by the grace and mercy of GOD. Senior Citizen? 84 on the 16th of May