A communications network comprises a plurality of beacons (10) for transmitting data to mobile receivers within range, each beacon (10) storing local data items for transmission to the mobile receivers which is dependent on the location of the beacon. A central controller (14) is provided for updating the local data items stored in the beacons. The central controller (14) enables beacons to be identified which require updating in response to a desired change in a local data item. This system uses a central controller that can manage the control and configuration and software running on the remote beacons. The central controller can efficiently monitor and control the content information running on each beacon to ensure the network is providing up-to-date alerts and messages to users.
