From our (Sweden) AIP
"3.0.8 AREA NAVIGATION (RNAV)
Note 32. It is recommended that operators, who have equipment flying with "off-set" function, use OFF-SET RIGHT 0.1 NM when flying enroute on ATS-routes in order to reduce the risk of mid-air collision (NOT to be used during Approach/STAR or Departure/SID phases of flight)"
Might shed some lights on the issue. Not sure how often operators actually do this :-?
I know that in the US above FL290, the minimum seperation between two aircraft is 5nm within 2000ft. Not sure if the rule is different in Europe or not, but I am sure that it probably similar.
I was under the impression that Eastbound and Westbound flight levels are odd and even numbers.. or is that just the North Atlantic track?
A bit like the old joke "A guy and his wife are flying off on holiday when there is a huge scream from most of the people in the plane, the husband turns to the wife and says 'I think we just had a near miss but I'm not sure as another plane got between us!'"
Semi circular rule in the upper airspace. Basically odd FLs from 000 to 179deg mag track (eg FL250), even FLs 180 to 359deg (eg FL260).
The Quadrantal rule is used in the lower airspace (000-089: odd (eg FL50); 090-179: odd+500' (eg FL55); 180-269: even (eg FL60); 270-359: even+500' (eg FL65))
Here's one they just made up: "near miss". When two planes almost collide, they call it a near miss.
Dont let them fool you, It's a near hit.
A collision is a near miss.
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