A wireless device having a physical location, the wireless device comprising: a wireless interface for communicating with a network of reference nodes, each being located at a respective set of physical coordinates in a physical coordinate system; and characterized in that the wireless device comprises: a location module configured to obtain a measurement of a respective signal communicated between the wireless interface and each of a plurality of said reference nodes, and to be supplied with a respective set of transformed coordinates for a transformed location of each of said plurality of reference nodes, the transformed coordinates being in a transformed coordinate system transformed relative to the physical coordinate system; wherein the location module is configured, using said signal measurements and the transformed coordinates of said plurality of reference nodes, to: a) submit information indicative of a transformed location of the wireless device to a server for the server to perform a calculation of a transformed location of the wireless device and to submit the transformed location of the wireless device to an interpretation function; or b) perform a calculation of a transformed location of the wireless device and submit the transformed location of the wireless device to an interpretation function; and to thereby access functionality relating to the physical location of the wireless device. a wireless interface for communicating with a network of reference nodes, each being located at a respective set of physical coordinates in a physical coordinate system; and characterized in that the wireless device comprises: a location module configured to obtain a measurement of a respective signal communicated between the wireless interface and each of a plurality of said reference nodes, and to be supplied with a respective set of transformed coordinates for a transformed location of each of said plurality of reference nodes, the transformed coordinates being in a transformed coordinate system transformed relative to the physical coordinate system; wherein the location module is configured, using said signal measurements and the transformed coordinates of said plurality of reference nodes, to: a) submit information indicative of a transformed location of the wireless device to a server for the server to perform a calculation of a transformed location of the wireless device and to submit the transformed location of the wireless device to an interpretation function; or b) perform a calculation of a transformed location of the wireless device and submit the transformed location of the wireless device to an interpretation function; and a) submit information indicative of a transformed location of the wireless device to a server for the server to perform a calculation of a transformed location of the wireless device and to submit the transformed location of the wireless device to an interpretation function; or b) perform a calculation of a transformed location of the wireless device and submit the transformed location of the wireless device to an interpretation function; and to thereby access functionality relating to the physical location of the wireless device.