The last time you navigated your way through a new city or neighborhood, you probably turned to Siri. Or maybe you opened up a GPS service device that offered you audible directions. Letting a robo-navigator guide you while driving to your destination makes perfect sense. Plus, Siri’s very polite compared to some human travel companions—who may spend the ride loudly judging your driving abilities. Much like we rely on technology to guide us while driving, we can let automated advisor services manage our investments.