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Techworld reports that the London Ambulance Service is using an application that switches among different networks according to priority. If they are within range of a Wi-Fi network, they use it to download maps to get to a patient, but if no Wi-Fi network is available, they switch over to GPRS (for example, to transmit patient data back to a hospital). According to the London Ambulance Service, the new system has saved them a lot of time: "It used to take approximately one minute to pass the call details to an ambulance crew by voice and then the crews may have needed to look where the destination was in their map books. Now it takes typically two seconds for all the call details to be sent to the ambulance, and the PC in the vehicle tells the navigation equipment where the destination is."