An electronics module (100) for a wearable article (200) comprises a controller. The electronics module receives biosignals such as ECG signals from sensors on the wearable article and processes these signals to provide data and information to a user. The controller is operable to apply filters to the incoming biosignals that have been digitised and processed by an analogue to digital converter. The filters are provided to remove, or at least mitigate, noise from the digital signal. An example of noise that could be advantageously removed is electromagnetic interference at mains frequencies. Mains frequencies are typically 50 Hz or 60 Hz depending upon location. The controller is configured to apply a suitable filter depending upon the location, which is determined from a GPS signal from a GPS device on the electronics module or on a remote mobile device (100). This has the advantage of being able to easily and quickly select and apply the relevant filter depending upon the location.