Redrive app for iPhone and iPad
Redrive offers multiple nice routes that you can enjoy with friends and family.
This application will track your location and shows if you are on the right track. Along the route, waypoints/controls with extra information about your route can be found and saved.
During the redrive the organiser of the route will be able to see scores of participating teams. After everyone is finished, an explanation about what went good/wrong will be shared.