Having received a World Heritage status in 2009 the Wadden Sea is recognized as one of the most important intertidal areas in the World (Baptist et al, 2007; Koffijberg & Smit, 2013). The Wadden Sea is not a pristine nature area, but also used by man. This human use may harm the natural values of the Wadden Sea, protected under de Natura2000 regime. Both human use and natural values are monitored, and some of this monitoring is required by law. This monitoring is of great value for science, policy and proper management of this unique area.