Perhaps the most important electronic development to impact the sport of mountain biking is the smartphone. Smartphones are quickly replacing dedicated GPS units, dedicated cameras, and other mobile music devices. Consequently, there are numerous GPS-enabled apps that allow you to track your mountain biking activities and navigate trail maps.
While there are numerous activity-tracking apps, Strava is probably the most popular. Other popular fitness apps include Runtastic Mountain Bike Pro, Map My Ride, Orux, and Endomondo. For on-trail navigation, Singletracks's own Singletracks Topo app brings on-trail navigation and the largest mountain bike trail map database in the world to the convenience of your Apple or Android phone.