Can you tell that the route directions you are following are wrong? Can you tell which part of these directions is incorrect? In our recently accepted paper on “defensive wayfinding”, Kai-Florian and I are investigating which kinds of uncertainty in route directions can be detected by wayfinders during wayfinding. Not much work has been done on this topic so far, and we are looking forwad to a lively discussion at COSIT. The uncorrected (accepted) version of the paper is available here: Defensive Wayfinding: Incongruent Information in Route Following.