| Significance | Code | Meaning |
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| 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 | 006 | 600 feet QNE | | | / | | | Centre Latitude | 5119N | 51° 19' North' | | Centre Longitude | 00158W | 1° 58' West | | Radius of area affected | 001 | 1 nautical miles |
| | UNLIT MAST AT POSITION 511914N 0015801W ( STERT,WILTSHIRE ) IN LOW FLYING AREA 1A AND NIGHT ROTARY REGION 1.HEIGHT 550FT ABOVE MEAN SEA LEVEL ( 80FT ABOVE GROUND LEVEL ). 25 / 01 / 117 / LFC |
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