Major defects – Berlin Subway: BVG U-Bahn map Review

I could not find my local station Guenzelstrasse, probably because the app does not understand the use of ue for the umlaut. When I tried to report the problem, the program trapped me in keyboard entry mode, with no done or save button so that I could send my problem report.
Review by Sjameselliott on Berlin Subway: BVG U-Bahn map.