With a navigation system, motorcyclists can leave their maps at home and—via the Web—share and swap their best rides. Since GPS units can record a given journey, you can upload a favorite route to a ride-sharing site such as SundayMorningRides.com. There you can scan through other riders' favorite trips and see photos and ride details. If a route looks good, download it to your GPS. Garmin's Zumo 550 (about $800) lets you do this via a USB link or a memory card. Then, back on the road, the 550 can guide you, turn-by turn, through virgin territories. The 550 packs a bright display, big glove-friendly buttons, and the latest GPS sensors into a waterproof case.