A modern take on paper roll charts used by motorcycle riders, bicyclists and rally drivers.-Plain-text chart entry-Tulip diagrams-Distance, odometer and bearing-SD card chart import/export -Built-in demos and manualInstall "RollChart Upgrade" for more features.If you have trouble with the app, please drop us a line.DANGER: If you have no idea what a roll chart is and what it’s for, you risk rating this application "stupid and useless" and will probably give it one star.