A method comprising: receiving at least one signal (50A,50B,50C) constituting a positioning packet (400a-e,402a-e,406a-e,408a-e) at a positioning device; processing the at least one signal (50A,50B,50C) by: demodulating a header of the positioning packet (400a-e,402a-e,406a-e,408a-e) from the at least one signal (50A,50B,50C); extracting an identifier from the header of the positioning packet (400a-e,402a-e,406a-e,408a-e); part processing samples of the at least one signal (50A,50B,50C); and forming a message from the part-processed samples; the method being characterised by: in response to receiving the at least one signal (50A,50B,50C), deactivating a receiver circuit of the positioning device for a period of time, the period of time constituting a sum of a time taken by the positioning device to process the at least one signal (50A,50B,50C) and a delay time, wherein the delay time is a preconfigured delay time or a random delay time; and activating the receiver circuit of the positioning device immediately subsequent the period of time. receiving at least one signal (50A,50B,50C) constituting a positioning packet (400a-e,402a-e,406a-e,408a-e) at a positioning device; processing the at least one signal (50A,50B,50C) by: demodulating a header of the positioning packet (400a-e,402a-e,406a-e,408a-e) from the at least one signal (50A,50B,50C); extracting an identifier from the header of the positioning packet (400a-e,402a-e,406a-e,408a-e); part processing samples of the at least one signal (50A,50B,50C); and forming a message from the part-processed samples; the method being characterised by: in response to receiving the at least one signal (50A,50B,50C), deactivating a receiver circuit of the positioning device for a period of time, the period of time constituting a sum of a time taken by the positioning device to process the at least one signal (50A,50B,50C) and a delay time, wherein the delay time is a preconfigured delay time or a random delay time; and activating the receiver circuit of the positioning device immediately subsequent the period of time. demodulating a header of the positioning packet (400a-e,402a-e,406a-e,408a-e) from the at least one signal (50A,50B,50C); extracting an identifier from the header of the positioning packet (400a-e,402a-e,406a-e,408a-e); part processing samples of the at least one signal (50A,50B,50C); and forming a message from the part-processed samples; the method being characterised by: in response to receiving the at least one signal (50A,50B,50C), deactivating a receiver circuit of the positioning device for a period of time, the period of time constituting a sum of a time taken by the positioning device to process the at least one signal (50A,50B,50C) and a delay time, wherein the delay time is a preconfigured delay time or a random delay time; and activating the receiver circuit of the positioning device immediately subsequent the period of time. in response to receiving the at least one signal (50A,50B,50C), deactivating a receiver circuit of the positioning device for a period of time, the period of time constituting a sum of a time taken by the positioning device to process the at least one signal (50A,50B,50C) and a delay time, wherein the delay time is a preconfigured delay time or a random delay time; and activating the receiver circuit of the positioning device immediately subsequent the period of time.