| Significance | Code | Meaning |
|---|
| 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 | 009 | 900 feet QNE | | | / | | | Centre Latitude | 5113N | 51° 13' North' | | Centre Longitude | 00159W | 1° 59' 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 511244N 0015858W,( TILSHEAD,WILTSHIRE ) RADIUS 0.6NM.MAXIMUM HEIGHT 300FT ABOVE GROUND LEVEL.24 / 11 / 149 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.547 NM 49FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.543NM 25FT ABOVE GROUND LEVEL LOW 0.552NM 73FT ABOVE GROUND LEVEL MEDIUM 0.559NM 114FT ABOVE GROUND LEVEL HIGH 0.5788NM 225FT ABOVE GROUND LEVEL PULSE LOW 0.541NM 11FT ABOVE GROUND LEVEL PULSE MEDIUM 0.542NM 18FT ABOVE GROUND LEVEL PULSE HIGH 0.545NM 34FT ABOVE GROUND LEVEL |
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