The rugged waterproof case resists fuel spray and UV rays and the display is easily readible in sunlight or on a moonless night. The preloaded City Navigator NT street maps have million points of interest and has 3-D building view and lane assist to further aid in navigation. The built in Bluetooth wireless technology allows you to make phone calls without having to remove your helmet or gloves. The Bluetooth also allows spoken street name and other voice prompt navigation. You can plan trips on your computer and transfer to the zumo 660 making it easy to plan trips with a group of riders. After a long trip, you can review you ride path on Google Earth, and the microSD car expander makes it easier to share routes or add storage. The zumo 660 can also be used as a in-car navigator giving even more flexiblity. On top of navigation, there are several entertainment features such as on board MP3 player, picture viewer and supports audio books. The Bluetooth A2DP technology gives crisp sound quality, and the motorcycle mount also comes with a standard headphone jack to connect to headphones or helmet headset and microphone.