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In page Schleswig-Holstein Wadden Sea National Park:

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Zone 2 forms a ‘buffer’ around the first zone, in which a sustainable use is possible. In protection zone 2 west of Sylt´s coast locates a protection area for small whales, eg. the common porpoise, with a size of 124.000 ha. It´s an important reproduction area of the porpoise, whose population declined about 90% in the North Sea during the 20th century. Activities like swimming, sailing or traditional crab fishing are still allowed in the area, while international industry fishing, jet-skis, ship velocities over 12 knots, military activities and resource exploitation (sand, grit, gas, oil) should be prevented.[3]