GES under criterion D11C1 is determined via indicator 'Distribution and intensity of impulsive underwater noise'. Daily exposure ≤ 20% of the assessment area, annual exposure ≤ 10% of the sea area: short-term (daily) exposure should not exceed the level of biological relevance in more than 20% of the assessment area; for long-term exposure (annual exposure), the average daily proportion of the area exposed to impulsive noise levels higher than level of biological relevance should not exceed 10% of the total assessment area.

GES under criterion D11C2 is determined via two indicators: 'Distribution and intensity of continuous underwater low-frequency noise in 125 Hz ddec' and 'Distribution and intensity of continuous underwater low-frequency noise in 500 Hz ddec'. GES is achieved, if: - LOBE at 125 Hz is exceeded 50% of the time in no more than 20% of the assessment area; - LOBE at 500 Hz is exceeded 50% of the time in no more than 20% of the assessment area.