One of the most important electronic products in the sport of mountain biking is the GPS unit. GPS units have allowed mountain bikers to log their statistics, including distance, overall speed, elevation gain and loss, top speed, average speed, and many more. GPS units have also allowed mountain bikers to easily create trail maps and recommended routes, and they've also helped countless riders navigate out of the woods after getting lost.
In recent years, many of the navigation-oriented GPS units have been discontinued in favor of the fitness-oriented models. However, across the whole spectrum of GPS units, the segment seems to be in a bit of a decline, thanks to the massive popularity of smartphones and GPS-enabled smartphone apps.
By far the largest producer of bike GPS units is Garmin, although there are a few other contenders in the market as well.