You would be surprised at the wealth of information a simple sat-nav device has to offer.

We regularly retrieve lists of destinations, home addresses and routes used by satnav devices, and in many circumstances, if the satnav has connected to a mobile phone, we can also retrieve phonebooks, call records and even text messages from the satnav device.

The information we can retrieve depends on the make and model of the device, but all devices contain information that may be of use.