Airspace Bases

Airport/EGXX/Airspace Bases.txt

These files contain airspace base freetext for those areas of controlled airspace that 'belong' to an airport (i.e. CTAs). Example for Luton CTA 1:

;CTA 1
2500':N051.57.21.170:W000.07.03.686

Note:

• 2500' is what will appear on the controller's display.
• The apostrophe ' should be appended after any bases that are an altitude.
• The colon : between the airspace base and latitude coordination, and the latitude and longitude coordinates are required for the base to be generated in the sector file correctly.
• There could be multiple labels (with the same airspace base value) for the same piece of airspace.

Misc/Freetext_Airspace Bases.txt

This file contains any remaining airspace bases that are required. Generally speaking, the maximum base that would be labelled is FL190 (since most FL195+ areas are displayed by a black region on the controller's display), though there are a few instances where this isn't the case - most notably, in the Southern CTA north of Stansted.

File contents ordering:

1. TMAs/CTAs/CTRs - in alphabetical order.
2. Remaining airways labels - no particular order.