Certificates of competency are graded as follows:
1. Grade I: ships of 3000GT and above, or ships with main propulsion power of 3000KW and above;
2. Grade II: ships of 500~3000GT, or ships with main propulsion power of 750~ 3000KW;
3. Grade III: ships of less than 500GT, or ships with main propulsion power of less than 750KW.