Tool tracking

A system configured to determine the location of a toolpiece, the system comprising:

• a tool carrying a toolpiece and comprising an imaging device configured to capture images of the environment around the tool, the tool being actuable to manipulate the toolpiece to work on a workpiece;
• and
• an image processor remote from the tool and communicatively coupled to the imaging device in order to receive images therefrom and having access to reference data representing an expected environment, the image processor being configured to compare an image captured by the imaging device with the reference data to identify a match therebetween and to determine in dependence on characteristics of that match the location of the toolpiece;
• wherein the system is configured to cause the tool to transmit images captured by the imaging device to the image processor in response to actuation of the tool and the tool is configured to inhibit the transmission of images captured by the imaging device to the image processor except in response to actuation of the tool.