| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | OB | Obstacle | | | CE | erected | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | M | Miscellaneous | | | / | | | Scope | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 018 | 1800 feet QNE | | | / | | | Centre Latitude | 5158N | 51° 58' North' | | Centre Longitude | 00305W | 3° 5' West | | Radius of area affected | 001 | 1 nautical miles |
| | UNMARKED UNLIT MAST OBSTRUCTION POSITION 515800N 0030452W ( CRUCORNEY,MONMOUTHSHIRE ) IN LOW FLYING AREA 7 AND NIGHT ROTARY REGION 7N.HEIGHT 1800FT ABOVE MEAN SEA LEVEL,100FT ABOVE GROUND LEVEL 26 / 05 / 149 / LFC |
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