How will the new geofencing work in Europe will it make my drone only fly 30 m or will it still be capable a flying 7 miles as per DJI sales brochure if this is the case will I be able to send my DJI drone back as it's not capable a doing what it says in the sales brochure I enjoy flying over the sea for long flight's I do not fly anywhere illegal

I'm afraid that there is no 30 m altitude zone in GEO system. Maybe you could call for DJI support for more details.