The International Certificate of Competence (ICC) or Boat License as it's often referred to can be issued to:
To obtain the International Boat License (ICC) you must prove your competence at driving a boat. If you have attended a qualifying RYA practical training course you simply send a copy of your certificate with your ICC application form. Alternatively, you can take a direct assessment at a RYA recognised training centre such as Boatability but the most common route to achieving the ICC is by attending a RYA Powerboat Level 2 course.
Essentially, the ICC boat license has six categories. When an ICC certificate is issued, only the categories for which competence has been proven will be validated. Categories are as follows:
Power up to 10m ICC
Power over 10m ICC (Or up to 24m/80Tonnes)
Sail up to 24m ICC
Personal Watercraft (PWC)