I had a near miss yesterday, flying IFR from Beccles to Leicester in the snow and god knows what else another aircraft apparantly not flying a Quadrantal rule passed over the top at me by no more than 50ft. Made my bum clench a little a bit!
Forwardn viz at the time was around 250-500m.
The big skies theory is great if everyone flies to the same set of rules, unfortunatly yesterday it proves that they do not!
So with 250 m forward vis you were able to ascertain that this aircraft, which you observed for, ooh about 4 seconds, was in level flight, not climbing or descending, and was therefore breaking the quadrantal rule?
