Wikipedia
Sportküstenschifferschein
The Sportküstenschifferschein (SKS) (sport-coastal ship-licence) is one of the official leisure craft licences in Germany. Training and testing is tailored to the driving of motor yachts and sailing yachts in coastal waters (all seas to 12 nautical miles distance from the mainland coast).
The SKS-proof driver's license equivalent to the English ability RYA/MCA Yachtmaster Coastal Certificate of Competence.