| 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 | W | Navigational Warning | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 013 | 1300 feet QNE | | | / | | | Centre Latitude | 5109N | 51° 9' North' | | Centre Longitude | 00145W | 1° 45' West | | Radius of area affected | 001 | 1 nautical miles |
| | E BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) IN LOW FLYING AREA 1A AND NIGHT ROTARY REGION 1 AT POSITION 510924N 0014512W,( BOSCOMBE,WILTSHIRE ) RADIUS 0.2NM.MAXIMUM HEIGHT 900FT ABOVE GROUND LEVEL.24 / 12 / 0257 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0966NM 268FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0540NM 9FT ABOVE GROUND LEVEL LOW 0.0979NM 276FT ABOVE GROUND LEVEL MEDIUM 0.1235NM 431FT ABOVE GROUND LEVEL HIGH 0.1929NM 853FT ABOVE GROUND LEVEL PULSE LOW 0.0540NM 9FT ABOVE GROUND LEVEL PULSE MEDIUM 0.0540NM 9FT ABOVE GROUND LEVEL PULSE HIGH 0.0540NM 9FT ABOVE GROUND LEVEL |
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