| 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 | 016 | 1600 feet QNE | | | / | | | Centre Latitude | 5320N | 53° 20' North' | | Centre Longitude | 00010W | 0° 10' West | | Radius of area affected | 001 | 1 nautical miles |
| | AIR NAV OBSTACLE LIGHT UK0171A168F RTM RTM BELMONT MAST SINGLE UNSERVICEABLE.POSITION 532009.07N,0001019.13W,ELEV / HEIGHT = 1566FT,1154FT. |
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