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12th February 2002 | 11:21

#12 (permalink)

swilliam

Joined: Feb 2002

Posts: 2

Likes: 0

From: Luxembourg

All the above make sense - but if you are flying in an area of vertically separated en route sectors, then setting 7700/7600/7500 will break thru' the radar filters so all sectors above and below can see you.