The protective film fits perfectly to the Navi. Operation is in no way impaired. Highlight: Without film I had always annoying reflections of bright parts on the screen, they are significantly less with the protective film. The actual film is packed between two protective films, which will last subtracted (if the film underneath sticks already hopefully without lint on the screen) with the scraps of paper, for the other pulling on the top piece with the name / number. Thus, with careful preparation (sooooo clean glass, use the included microfibre cloth!) Already draufgekommen the first of three films clean (not like many times before in other devices the first to practice :-) The microfiber cloth is again specially sealed to prevent it is to Fusselquelle.