Table 3. Waterbird counts in the non-breeding season − calculation of costs. Calculation of labour costs in the field; payment methods and study methods are distinguished.

Form of payment	Form of counting	Cost of one count in the study area (530 km2 and 340 km of coastline) in Euros	Cost of one count over a 100 km2 water body in Euros	Cost of one count along a 100 km coastline (ground count) and 100 km of flight route (air count) in Euros
Voluntary	Aircraft	720	136	180
Voluntary	Ground	300	57	88
Paid service	Aircraft	1,400	264	350
Paid service	Ground	2,300	434	677