The app comes with a vector map of the entire world. You can then download specific areas to get complete detail (i.e. down to hiking trails and city blocks) be

The app comes with a vector map of the entire world. You can then download specific areas to get complete detail (i.e. down to hiking trails and city blocks) before you head out -- depending which maps you want you'll download via small country (e.g. France) or state (e.g. California). All goTenna maps are free!