| 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 | 5155N | 51° 55' North' | | Centre Longitude | 00204W | 2° 4' West | | Radius of area affected | 009 | 9 nautical miles |
| | GNSS ( GPS ) SIGNAL AND RADIO FREQUENCY JAMMING MAY OCCUR WHEN ESSENTIALLY REQUIRED ON AN OPERATING BASIS.JAMMERS LOCATED WITHIN 2NM RADIUS POSITION 515514N 0020343W ( CHELTENHAM ). ACTIVITY MAY AFFECT AIRCRAFT WITHIN 6NM SURFACE TO 30000FT ABOVE MEAN SEA LEVEL OR ABOVE ( ALL DIRECTIONS ) IF EMPLOYED IN EXTREMIS.MAY ALSO AFFECT AIRBORNE ELECTRONIC SITUATIONAL AWARENESS DEVICES AND UAS CONTROL.GNSS ( GPS ) RECEIVERS MAY SUFFER INTERMITTENT / TOTAL FAILURE OR GIVE INCORRECT POSITION INFO.SOME ELECTRONIC SITUATIONAL AWARENESS DEVICES AND UAS MAY SUFFER INTERMITTENT / TOTAL FAILURE OR GIVE INCORRECT NOTIFICATION.FOR INFO / CEASE JAMMING 07966 516802.AR-2026-479 / 01. |
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