GPS jamming exercises
The Ministry of Defence conducts occasional tests on military systems, which may result in some loss of service to civilian users of the Global Positioning System (GPS) including in-car navigation devices and networks which rely on GPS signals.
Ofcom seeks to provide citizens and consumers with information about possible interruptions to these services. It must be emphasised that this notification process only warns of future jamming exercises that are brought to the notice of Ofcom and may not cover all jamming exercises. It cannot be assumed that any loss of service is due to jamming exercises.
If you have any queries regarding these notices, please forward them to InfoGPS.Notices@ofcom.org.uk.
Dates: The exercise will run over the periods 8 – 13 and 15 – 19 February 2021
Location: The jamming events will take place within 1km of grid reference NF 754 412 (WGS84 Lat N57° 20.75’ Long W007° 23.89’).
Times: 10:00 – 16:00.
Frequencies: 1557 – 1612 MHz, 1215 – 1256 MHz, 1160 – 1214 MHz
Areas of effect against a receiver:
- 2m AMSL
- In an arc clockwise from 340°T to 035°T to 22NM
- In an arc clockwise from 035°T to 150°T to 8NM
- In an arc clockwise from 150°T to 195°T to 25NM
- In an arc clockwise from 195°T to 340°T to 8NM
- 25m AMSL
- In an arc clockwise from 340°T to 045°T to 22NM
- In an arc clockwise from 045°T to 180°T to 11NM
- In an arc clockwise from 190°T to 195°T to 25NM
- In an arc clockwise from 195°T to 340°T to 20NM
- 75m AMSL
- In an arc clockwise from 340°T to 075°T to 22NM
- In an arc clockwise from 075°T to 180°T to 11NM
- In an arc clockwise from 180°T to 340°T to 27NM
- 1,000ft AGL
- In an arc clockwise from 190°T to 350°T to 50NM
- To 30NM in all other directions
- 5,000ft AGL
- In an arc clockwise from 180°T to 035°T to 90NM
- To 20NM in all other directions
- 10,000ft AMSL
- In an arc clockwise from 180°T to 035°T to 125NM
- To 20NM in all other directions
- 20,000ft AMSL
- In an arc clockwise from 180°T to 035°T to 170NM
- To 20NM in all other directions
- 30,000ft AMSL
- In an arc clockwise from 180°T to 035°T to 180NM
- To 20NM in all other directions
- 40,000ft AMSL
- In an arc clockwise from 180°T to 040°T to 175NM
- To 20NM in all other directions
- 50,000ft AMSL
- In an arc clockwise from 180°T to 040°T to 170NM
- To 20NM in all other directions NM.
Please note that while interference plots are provided up to 50,000ft the effects will not stop at this height and higher altitudes should assume the 50,000ft interference footprint.
Dates: The exercise will run over the period 30 March – 29 May 2021.
Location: The emitter shall be positioned within 250m of 52° 8'28.02"N, 4°34'15.25"W
Frequencies: 1565 – 1585 MHz, 1217 – 1237 MHz
Worst case areas of effect against a receiver:
Antenna performance evaluation, 30 – 31 March
Directional system evaluation, 30 – 31 March
Interference zones at 2, 25 and 70m
Interference zones at 1,000 and 5,000 ft
Interference zones at 10,000 and 20,000 ft
Maximum permitted power evaluation , 30 – 31 March. Flight trials, 11 May – 13 May, 18 May – 20 May, 25 May – 27 May
Interference zones at 2, 25 and 70m
Interference zones at 1,000 and 5,000 ft
Interference zones at 10,000 and 20,000 ft
Interference zones at 30,000 and 40,000 ft
Dates: The exercise will run over the period 5 – 9 April 2021.
Location: Jammers will be located in the vicinity of Berry Hill HLS RAF Spadeadam. Lat/Lon N55° 03.1’ W002° 33.3’ (British National Grid reference NY646732)).
Times: 09:00 – 17:00.
Frequencies: 1565 – 1586 MHz, 1217 – 1238 MHz, 1188.45 – 1217 MHz.
Worst case areas of effect against a receiver:
- 2 m AGL: Receivers with clear line of sight to the jammer location to a maximum possible range of 53km.
- 25 m AGL: Receivers with clear line of sight to the jammer location to a maximum possible range of 53km.
- 2000 ft AGL: To a maximum possible range of 30 NM.
- 4000 ft AGL: To a maximum possible range of 30 NM.
- 8000 ft AMSL: To a maximum possible range of 30 NM.
- 10,000 ft AMSL: To a maximum possible range of 30 NM.
- 20,000 ft AMSL: To a maximum possible range of 30 NM.
- 40,000 ft AMSL: To a maximum possible range of 30 NM.
Dates: The exercises will run over the periods 24 May – 14 June 2021, 5 – 30 July 2021, 6 September – 1 October 2021, 1 – 26 November 2021.
Location: Jammers will be located at MoD West Freugh and within the Luce Bay Danger Area.
Times: 08:30 – 16:00.
Frequencies: 1560 – 1609 MHz, 1212 – 1252 MHz.
Worst case areas of effect against a receiver:
- 2m AMSL - Up to 7 km (4 nm), but directional (see Figure A1).
- 25m AMSL - Up to 20 km (11 nm), but directional (see Figure A2).
- 70m AMSL - Up to 40 km (22 nm), but directional (see Figure A3).
- 5,000ft AMSL – Up to 50 km (27 nm) in all directions.
- 10,000ft AMSL – Up to 90 km (49 nm) in all directions.
- 20,000ft AMSL – Up to 90 km (49 nm) in all directions.
- 30,000ft AMSL – Up to 90 km (49 nm) in all directions.
- 40,000ft AMSL – Up to 90 km (49 nm) in all directions
