Slightly off topic, but who makes MLS now? Last I heard, the major US manufacturer (Wilcox) had stopped, the argument being that differential GPS was more accurate. Radeng can show his age by remembering back when the various MLS systems were being evaluated by ICAO, and the present one chosen. That was when radeng was an apprentice and I'm 4 years off retirement now.......I know NATO keep saying that they're going to equip lots of European airfields with it, but haven't heard in the industry much in the way of the orders having appeared. The NATO argument may be one to keep the (currently unused!) frequency allocation