Abstract: The present invention concerns a method for identifying a user (1) of a signalling unit (2) when said user (1) performs a physical interaction with a user interface (3) of the signalling unit (2), thereby requesting a signalling unit action (12), wherein said user (1) carries an identification tag (4), the method comprising the steps of: a) transmitting, by the signalling unit, a signalling unit message as variations in a magnetic field (5); b) receiving said signalling unit message by the identification tag (6), and subsequently radiofrequently transmitting a tag response message by the identification tag (7), said tag response message comprising identification information of the user carrying said identification tag, c) receiving, by the signalling unit, said tag response message (8), thereby identifying the user requesting the signalling unit action (9), whereby said transmission is initiated upon said physical interaction of the user (1) at the user interface (3) of the signalling unit (2).

Abstract: The invention refers to a method of using a tag in a localisation system, the method comprising at said tag operating a magnetic induction signal detection circuit to detect signals, and upon detection of a magnetic induction signal comprising a first identification code: correlating the magnetic induction signal comprising said first identification code to an ultrasound signal comprising a second identification code, received via an ultrasound signal detection circuit. If said correlation reveals an association between said first identification code and said second identification code: a radio frequency announcement signal is transmitted via a radio frequency signal transmitter circuit to signify said association. The invention also refers to a method of using a beacon in said localisation system, as well as the localisation system comprising one or more tags and one or more beacons.