A tracking apparatus (1) comprising: a first mobile transceiver unit (2), and a second mobile transceiver unit (3), the first mobile transceiver unit being in wireless communication with the second mobile transceiver unit for the transfer of data therebetween, the first mobile transceiver unit being arranged for location within an environment and being operable to determine data regarding the environment and to emit some or all of the determined data which is received by the second mobile transceiver unit for storage thereon when it is determined by the first mobile transceiver unit that the second mobile transceiver unit is located within a distance of the first mobile transceiver unit.
