| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | GW | GNSS Area-wide operations | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | N | For immediate attention of aircraft operators | | | 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 | 999 | Unlimited | | | / | | | Centre Latitude | 5206N | 52° 6' North' | | Centre Longitude | 00003W | 0° 3' West | | Radius of area affected | 011 | 11 nautical miles |
| | GNSS ( GPS ) SIGNAL JAMMING.JAMMERS LOCATED 520549N 0000324W ( BASSINGBOURN ). ACTIVITY MAY AFFECT AIRCRAFT WITHIN 10NM SURFACE TO 34000FT ABOVE MEAN SEA LEVEL OR ABOVE ( ALL DIRECTIONS ). MAY ALSO AFFECT AIRBORNE ELECTRONIC SITUATIONAL AWARENESS DEVICES AND UAS CONTROL.GNSS ( GPS ) RECEIVERS MAY SUFFER INTERMITTENT / TOTAL FAILURE OR GIVE INCORRECT POSITION INFO.FOR INFO / CEASE JAMMING 07595 338930 OR 07483 515458.AR-2026-864 / 01. |
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