RATING 1 (Heavy Duly Commercial)
For commercial vessels with displacement hulls in heavy operation. Load and speed could be constant, and full power can be used without interruption.

RATING 2 (Medium Duty Commercial)
For commercial vessels with semiplaning or displacement hulls in cyclical operation. Full power could be utilized max 4 h per 12 h operation period. Between full load operation periods, engine for boat speed should be reduced at least 10% from the obtained full load engine speed.

PRIME POWER (Gensets and Auxiliary engines with constant speed ratings) For continuous service -overloadable by 10% for one hour within an operating period of 12 hours.