SAS things have changed slightly - we do not fly along VOR radials, rather along gps tracks called HMRs. However, when crossing HMRs (radials to you!) we have to have a method of reporting position that everyone understands, so we use bearing and distance from the ADN VOR, but since VORs are pretty inaccurate or out of range, we use the gps bearing and distance from the ADN waypoint.
That means we can all give a pretty accurate position indication that is easy to understand (much harder if we were to give lat and long) and common to all operators OR SO I THOUGHT until we found last year that a certain fleet had an out of date magnetic variation table in its GPSs - gps need mag var to convert the true gps bearing from the ADN waypoint to magnetic.The data was many years out of date so the bearings reported were off by several degrees. Several degrees at 120nm = a lot of lateral error! All fixed now but just goes to show how easy it is to get it all horribly wrong!
HC