Unfortunately, for some reason, most navigation-oriented GPS systems seem to be explicitly designed to keep you as geographically ignorant as they possibly can. They only show a map that displays not much more than your visual field of view, and only tell you about turns when you're almost on top of them. Want to actually know your full course, ON A MAP, in advance? Forget it. Even if they have the ability, its too frustrating and laggy to access it.
This is why I love how Tesla has designed their navigation system. You get the typical GPS-nav-type view on the dashboard, but the center console shows a big Google Maps view of your route. The center console map also has a list of your next few turns overlaid on it, so you're not caught unaware by what to do next.