| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | RO | Overflying restriction | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | N | For immediate attention of aircraft operators | | | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | A | Aerodrome information | | | W | Navigational Warning | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 025 | 2500 feet QNE | | | / | | | Centre Latitude | 5110N | 51° 10' North' | | Centre Longitude | 00145W | 1° 45' West | | Radius of area affected | 006 | 6 nautical miles |
| | HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) B2011 ACTIVE AT POSITION 510939N 0014522W BOSCOMBE DOWN WITHIN 5NM RADIUS MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.040NM 301FT ABOVE GROUND LEVEL / 676FT ABOVE MEAN SEA LEVEL LOW 0.070NM 404FT ABOVE GROUND LEVEL / 779FT ABOVE MEAN SEA LEVEL MEDIUM 0.120NM 691FT ABOVE GROUND LEVEL / 1066FT ABOVE MEAN SEA LEVEL HIGH 0.320NM 1929FT ABOVE GROUND LEVEL / 2304FT ABOVE MEAN SEA LEVEL PULSE LOW / MEDIUM / HIGH 0.00NM 0FT ABOVE GROUND LEVEL / 375FT ABOVE MEAN SEA LEVEL THIS ACTIVITY IS WHOLLY CONTAINED WITHIN THE AIR TRAFFIC ZONE / MATZ |
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