RallyBlitz Nav Pro™
Here it is. The App that has Nav Gear, Waypoint Guidence, Roadbook, Waypoint mapping and much more in a single App. The free version provides basic functions and the upgrade allows you to rally like the big boys.
You'll need an iPad mini with 4G (no SIM required but 4G has the required GPS chip) or a more current iPhone.
Digital Rallye Reference Page