| 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 | 008 | 800 feet QNE | | | / | | | Centre Latitude | 5112N | 51° 12' North' | | Centre Longitude | 00152W | 1° 52' West | | Radius of area affected | 002 | 2 nautical miles |
| | E BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) IN LOW FLYING AREA 1A AND NIGHT ROTARY REGION 1 AT POSITION 511215N 0015153W,( SHREWTON,WILTSHIRE ) RADIUS 1NM.MAXIMUM HEIGHT 225FT ABOVE GROUND LEVEL.24 / 11 / 155 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.5476NM 49FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.5438NM 25FT ABOVE GROUND LEVEL LOW 0.5522NM 73FT ABOVE GROUND LEVEL MEDIUM 0.5594NM 114FT ABOVE GROUND LEVEL HIGH 0.5788NM 225FT ABOVE GROUND LEVEL PULSE LOW 0.5413NM 11FT ABOVE GROUND LEVEL PULSE MEDIUM 0.5426NM 18FT ABOVE GROUND LEVEL PULSE HIGH 0.5453NM 34FT ABOVE GROUND LEVEL |
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