| 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 | A | Aerodrome information | | | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 001 | 100 feet QNE | | | / | | | Centre Latitude | 5239N | 52° 39' North' | | Centre Longitude | 00033E | 0° 33' East | | Radius of area affected | 001 | 1 nautical miles |
| | OBSTACLE ERECTED ON MARHAM AERODROME ( DATUM MARKER ) AT POSITION 523856N 0003310E ( HDG 070 DEG MAGNETIC,160M FROM MARHAM AERODROME REFERENCE POINT ) HEIGHT 8FT ABOVE GROUND LEVEL,84FT ABOVE MEAN SEA LEVEL |
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