| 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 | 007 | 700 feet QNE | | | / | | | Centre Latitude | 5116N | 51° 16' North' | | Centre Longitude | 00144W | 1° 44' 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 511535N 0014405W,( FITTLETON,WILTSHIRE ) RADIUS 0.3NM.MAXIMUM HEIGHT 100FT ABOVE GROUND LEVEL.25 / 05 / 302 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.2698NM 7FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.2700NM 7FT ABOVE GROUND LEVEL LOW 0.2739NM 29FT ABOVE GROUND LEVEL MEDIUM 0.2761NM 42FT ABOVE GROUND LEVEL HIGH 0.2823NM 77FT ABOVE GROUND LEVEL PULSE LOW 0.2700NM 7FT ABOVE GROUND LEVEL PULSE MEDIUM 0.2700NM 7FT ABOVE GROUND LEVEL PULSE HIGH 0.2753NM 37FT ABOVE GROUND LEVEL |
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