Thanks Andy
the list is further sorted into two sections, the first "Specific FIR" (radius of influence 30NM or less) and "General FIR" (radius of influence greater than 30NM) - this is an arbitrary distinction and doesn't help and together with the above means the entire list has to be sifted through to be sure not to miss anything pertinent to one's planned route
The reasoning behind this is:-
All NOTAM have a geographic centre and a radius of influence. The geographic centre of something affecting the whole of EGTT would be somewhere in the Midlands, with a radius big enough to cover the entire FIR. If it affects both FIR's it's geographic centre is even further north.
On Friday I flew Popham to Sandown and would have ignored something in the Midlands as being irrelevant to my intended flight, however it would have been relevant if it affected the whole FIR.
The cut-off of 30nm was chosen so that you should only need to search from 30nm north of your intended area of operation to 30nm south in order to find anything that might affect you.
You then need to check the second section to find anything affecting a wider area.
Hope this makes sense
Mike
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