[FAQ] Where to buy: Buy directly at the ICAO online store then when you pay, you received the ICAO FIR 2017 shape file directly by Email
Precision for the boundary (limit of the country) in the FIR files,Data precision required to define Flight Information Regions (FIRs): ICAO FIR DATA PRECISION
The creation of an FIR are made with coordinate normally and when the description of that FIR follow the country boundary we follow the Digital chart of the world with reduce point at the beginning, because at that time the computer are not enough strong to take all the points, so the precision for the line following the country boundary are not full precise but a good representation of the reality, with the version ICAO FIR 2014 some country boundary are from ESRI shape file country 2008 (25 meg) much better then before, with the version ICAO FIR 2017 some country boundary are from United Nation in New York 2012 shape file. With the version ICAO FIR 2017 we take the Global_LSIB_Lines_Simplified_2015Jan23_USG:
Work flow for the FIR files
Discussion about the creation of the FIR data base: The ICAO FIR are made with official ANP amendments (regional air navigation agreement) that take more time for the Official anwser, so sometime the AIP from State has already the change before ICAO, conclusion to follow all the change faster, we create two files to send to you; the ICAO FIR Official (approuve by the conseil) and an other one ICAO FIR FORESEEN UPDATE (ICAO FIR MISE A JOUR PREVUES) following many sources to verification for quality control. I believe that the eANP WG assumed that the Information that was held by HQ in terms of the FIR and SRR boundaries came from ANP amendments over the years (i.e.: as a result of regional air navigation agreements at things like Regional Air Navigation meetings). If in fact the data has been amended by using AIP Information from States like I think you described for Chennai then that could be a major problem, as AIP Information is quite often different between States and is not subject to regional air navigation agreement as required by Annex 11. So we must find a better work flow to correct that situation
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