| 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 | 5117N | 51° 17' North' | | Centre Longitude | 00203W | 2° 3' 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 511654N 0020242W ( ERLESTOKE,WILTSHIRE ) RADIUS 0.1NM.MAXIMUM HEIGHT 267FT ABOVE GROUND LEVEL.25 / 02 / 069 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0628NM 66FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0591NM 44FT ABOVE GROUND LEVEL LOW 0.6072NM 93FT ABOVE GROUND LEVEL MEDIUM 0.0749NM 140FT ABOVE GROUND LEVEL HIGH 0.0959NM 267FT ABOVE GROUND LEVEL PULSE LOW 0.0606NM 53FT ABOVE GROUND LEVEL PULSE MEDIUM 0.0672NM 93FT ABOVE GROUND LEVEL PULSE HIGH 0.0804NM 173FT ABOVE GROUND LEVEL |
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