Abstract: The present invention is concerned with a tracking device (10) including: a sensor system (12) configured to determine at least one movement parameter of the tracking device and output movement parameter data; a power supply (34) arranged to supply electrical power to the tracking device; a memory (30); and a processor system (24) including: a data processor (26) configured, in accordance with one or more operational parameters stored in the memory, to: control the determination of said at least one movement parameter by the sensor system; and process the movement parameter data and output one or more derived parameters; and a second data processor (26) configured to: operate independently from the data processor; and manage access to the memory and storage therein of: the one or more operational parameters; a log of said movement parameter data output from the sensor system; and said derived parameters.