The Rules governing the Europa Cup Ranking have been updated.
Each nation now is entitled to two Europa Cup events, where the Open National Championship is one of these. Special Europa Cup events may be added by the CIV.
The most up-to-date calendar including all EC events can be found here.
Also the scoring has been updated and simplified. For the EC ranking, each boat shall be awarded 1000 x (number of event participants - place) points, while the last boat gets 1 point. A maximum of four EC races shall be scored for the overall ranking.
The full rules text can be found here.