Recreational boats, what documentation is needed?

The degree certifies the aptitude for boat governance
Documentation necessary to steer a pleasure boat:

RELATING TO THE VESSEL
Flagging
Enrollment
Registration Patent of navigation for over 20 GRT list 6th – 7th for more than 24 meters
Spanish registration certificate
Navigation permission
Navigation license or role, dispatched for corresponding list
Certificate of navigability (up to date of inspections and recognition)
Insurance policy

Source of information:
Maritime Rescue