| 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 | 005 | 500 feet QNE | | | / | | | Centre Latitude | 5111N | 51° 11' North' | | Centre Longitude | 00123W | 1° 23' 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 511058N 0012241W ( BARTON STACEY,BRANSBURY ) RADIUS 0.1NM.MAXIMUM HEIGHT 267FT ABOVE GROUND LEVEL.25 / 02 / 067 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0520NM 66FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0483NM 44FT ABOVE GROUND LEVEL LOW 0.0564NM 93FT ABOVE GROUND LEVEL MEDIUM 0.0641NM 140FT ABOVE GROUND LEVEL HIGH 0.0851NM 267FT ABOVE GROUND LEVEL PULSE LOW 0.0498NM 53FT ABOVE GROUND LEVEL PULSE MEDIUM 0.0564NM 93FT ABOVE GROUND LEVEL PULSE HIGH 0.0696NM 173FT ABOVE GROUND LEVEL |
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