3pRally Pro - TSD Rally

3pRally Pro: The Ultimate Tool for TSD Regularity Rally 3pRally is now subscription-based, but you can use all app functionalities for up to 45 minutes a day, after tapping "start", to test it out. 3pRally requires a device with GPS to function. The GPS sensor can be either internal (iPhone and iPad with Cellular) or external (e.g., Garmin GLO 2, Dual XGPS150A, etc.). Main Features: - Universal App - Three Modes: Classic (focus on one data point at a time), Advanced (all relevant data at a gl