Car drivers can get away with using the GPS function of their smartphone when mapping out a route, but that’s not good enough for a motorcycle. The screen is too hard to see, the possibility of dropping the phone on the road is too great, and of course there’s the risk of rain or snow. That’s why motorcycle GPS units are made of sturdier stuff. Make sure you look for a unit that can keep up with you. The screen should be anti-glare, the mount secure, the casing waterproof, and the unit tough enough to handle vibration. Many of the modern motorcycle GPS units listed on eBay also have bonus features such as satellite radio, Bluetooth integration, and speed alert. Start browsing to see which one is right for you.