Since it s a portable unit you can place it on the dashboard of your rental car and plug it into the 12-volt power outlet. You can also run it off the internal AA batteries but they get devoured pretty quickly. That beautiful color display eats faster than a tourist at a Vegas buffet. I have to get around a lot in my work. Maybe, but I'm not sure I'd use it enough to make it worth the cost.
Maps are a lot cheaper.
This is a portable version of the Hertz NeverLost navigation system found in some of their rental cars. The 750M is perfect for any guy who refuses to ask for directions. It not only shows you where you are but also verbally guides you to your destination. Appropriately, ours had a female voice telling us where to go. This complex yet portable navigation system isn't cheap.