As we travel from one place to another, we often need to consider the costs and the benefits of possible routes. For example, one might have to decide whether to take a shorter route on the freeway, risking a delay if the traffic is heavy, or a longer, but less crowded, route on surface streets. Mistakes in navigation also differ in their relative costs: Selecting the wrong path in open terrain may create a delay in getting to one’s destination but is unlikely to be fatal. By contrast, selecting the wrong path in mountainous terrain could lead one into life-threatening, precipice-filled areas from which egress is difficult. This line of research investigates whether navigators account for the costs of navigational errors and paths in principled and quantifiable ways, and whether there are systematic individual differences in the selection of decision rules.