| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | NX | Direction finding station | | | AS | unserviceable | | | / | | | Traffic | V | VFR traffic affected | | | / | | | Purpose | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 660 | 66000 feet QNE | | | / | | | Centre Latitude | 5120N | 51° 20' North' | | Centre Longitude | 00120E | 1° 20' East | | Radius of area affected | 060 | 60 nautical miles |
| | THE EMERGENCY FREQUENCY DIRECTION FINDING NETWORK WITHIN 60NM OF POSITION 5120N 00120E ( MANSTON ) UNSERVICEABLE.WHICH MAY RESULT IN A DELAY IN IDENTIFYING AIRCRAFT OPERATING AT LOWER LEVELS OVER THE SOUTH-EAST OF ENGLAND ON FREQUENCIES UHF 243.0MHZ,245.1MHZ AND VHF 121.5MHZ |
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