Ofcom has announced an exercise to test the GPS SatNav system. It will take place around the Stanford area in East Anglia between 19 and 23 September and 3 to 7 October. Authorised jammers will be operating between 9am and 5.30pm. Safety of Life operations will at all times take precedence over exercise activities. For further information contact InfoGPS.Noticesofcom.org.uk.