| 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 | 011 | 1100 feet QNE | | | / | | | Centre Latitude | 5047N | 50° 47' North' | | Centre Longitude | 00150W | 1° 50' West | | Radius of area affected | 001 | 1 nautical miles |
| | E BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) IN LOW FLYING AREA AND NIGHT SECTOR AT POSITION 504653N 0015023W,( BOURNEMOUTH AIRPORT,CHRISTCHURCH AND POOLE ) RADIUS 0.1NM.MAXIMUM HEIGHT 857FT ABOVE GROUND LEVEL.24 / 03 / 211 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0966 NM 272FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0679 NM 98FT ABOVE GROUND LEVEL LOW 0.0979 NM 280FT ABOVE GROUND LEVEL MEDIUM 0.1235 NM 435FT ABOVE GROUND LEVEL HIGH 0.1929 NM 857FT ABOVE GROUND LEVEL PULSE LOW 0.0577 NM 36FT ABOVE GROUND LEVEL PULSE MEDIUM 0.0615 NM 59FT ABOVE GROUND LEVEL PULSE HIGH 0.0690 NM 104FT ABOVE GROUND LEVEL |
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