| Significance | Code | Meaning |
|---|
| 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 | 5156N | 51° 56' North' | | Centre Longitude | 00116W | 1° 16' West | | Radius of area affected | 008 | 8 nautical miles |
| | GNSS ( GPS ) SIGNAL JAMMING.JAMMERS LOCATED WITHIN 1NM RADIUS POSITION 515627N 0011557W ( UPPER HEYFORD ). ACTIVITY MAY AFFECT AIRCRAFT WITHIN 6NM SURFACE TO 31700FT 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 07813 042239 / 07974 125870.AR-2026-4292 / 01. |
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