The "Sportküstenschifferschein" (SKS) is a German driving license for pleasure crafts in costal waters not exeeding 12 nautical miles.
To get the license you have to pass three tests: a written one, a navigation test and a practical test.
This app is to prepare yourself for the written test. It contains all the questions you may get asked in the written exam. If you are able to answer all the questsion in this app, you will pass the written exam.