| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | OL | Obstacle lights | | | AS | unserviceable | | | / | | | 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 | 004 | 400 feet QNE | | | / | | | Centre Latitude | 5127N | 51° 27' North' | | Centre Longitude | 00042E | 0° 42' East | | Radius of area affected | 001 | 1 nautical miles |
| | OBSTACLE LIGHT UNSERVICEABLE AT POSITION 512637N 0004226E ( ISLE OF GRAIN,ESSEX ) IN THAMES VALLEY AVOIDANCE AREA DAY AND NIGHT HEIGHT 308FT ABOVE MEAN SEA LEVEL ( 295FT ABOVE GROUND LEVEL ). 25 / 03 / 325 / LFC |
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