Norway is going to establish controlled airspace (D) from 1500 to FL85 in what is Balder and Ekofisk ADS areas now. Airspace will be the first in Europe based solely on ADS-B
re the radio calls - it helps (a lot) that you have radar coverage right down to deck height in the Norweigan sector.
This is not true, the only offshore radars are at Gullfaks and Norne.