Two major problems with this app: (1) It doesn’t recognize stations spelled with an umlaut, which makes it useless in many cases, and (2) It doesn’t tell you which way to go on a given line. That is, of course, a vital piece on information, and to find out you’ve got to trace that little blue line all the way to the edge of the map. What a pain!! Get Fahrinfo Berlin instead. It avoids the two pitfalls above, and also suggests often-faster bus routes between U- or S-Bahn stations.