| Significance | Code | Meaning |
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| FIR | EGPX | Scottish 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 | 5525N | 55° 25' North' | | Centre Longitude | 00136W | 1° 36' West | | Radius of area affected | 002 | 2 nautical miles |
| | D BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) OPERATING WITHIN 1NM OF POSITION 552515N 0013602W ( BOULMER,NORTHUMBERLAND ) LOW FLYING AREA 12 AND NIGHT SECTOR 4AN.MAXIMUM HEIGHT 557FT ABOVE GROUND LEVEL.26 / 09 / 113 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0796NM 205FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0623NM 100FT ABOVE GROUND LEVEL LOW 0.0811NM 214FT ABOVE GROUND LEVEL MEDIUM 0.0958NM 303FT ABOVE GROUND LEVEL HIGH 0.1375NM 557FT ABOVE GROUND LEVEL PULSE LOW 0.0560NM 62FT ABOVE GROUND LEVEL PULSE MEDIUM 0.0580NM 74FT ABOVE GROUND LEVEL PULSE HIGH 0.0621NM 98FT ABOVE GROUND LEVEL |
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