But have you any idea about R/T in non-controlled airspace? Imagine my poor little ultralight from Hoevenen EBHN to Midden-Zeeland EHMZ, it can be done outside controlled airspace and outside TMZ, I understand I should switch my transponder off and still call Dutch Mil when entering Amsterdam FIR?
You've got a Mode-C transponder then? Not a Mode-S?
In that case, officially, you can't use it in Dutch airspace, and need to remain below 1200' with the transponder off. You then tell Dutch Mil you're entering, and when leaving the frequency for Midden-Zeeland.
Unofficially I know that the persons behind the radar scope will ask you to keep the transponder on, as it's better than nothing. But you've got to remain below 1200'.
EHMZ is a nice place to go to. The restaurant is quite nice, and the airport authorities now have a bunch of bicycles on-site for rent. Arnemuiden and various beaches are all within easy cycling distance of the field.