S Transponerss in thw Netherland
This is the applicable bit.
A friend has just returned from a trip accross Belgium, Netherland and Germany with S type
2 — USE OF SSR MODE S TRANSPONDER FOR MOTORISED VFR FLIGHTS
WITHIN THE AMSTERDAM FIR
The use of a SSR mode S transponder is mandatory within the Amsterdam FIR for VFR flights with motorised aircraft (including microlight aeroplanes (MLA), touring motorgliders (TMG), and helicopters) in the complete FIR, excluding airspace class G below 1200 ft AMSL, where it is not within the North Sea Area Amsterdam (NSAA).
Aircraft with an operational SSR mode S transponder have to activate the transponder at all altitudes in all types of airspace, even when it is not mandatory to use a transponder in that area.
Motorised aircraft that are not equipped with a SSR mode S transponder have only access to airspace with class G below 1200 ft AMSL.