The many companies that sell software for computer forensics have developed products for analysing satellite navigators. Police high tech crime units and independent laboratories now use this software on an industrial scale. Computer technicians conduct the analyses. This is home territory for them, since the biggest component of a vehicle satellite navigator is a computer, often running the Linux operating system, and with access via a USB connection or an SD card. The analysis software extracts addresses which it plots using tools such as Google Maps. Specialists extract similar data from satnavs built into vehicles. But many investigating officers find the results disappointing…