A system for providing orientation information with regard to a limited spatial area (18, 18a, 18b), characterized by an illumination means, and a mobile electronic terminal device, in particular a Smart-Device, wherein the illumination means comprises: at least one light source; and a modulation device for modulating the light transmitted by the light source; wherein the modulation device is configured, by modulating the light transmitted by the light source, to encode data to the light which data contain a unique identification of the illumination means or identify a spatial position of the illumination means within the limited spatial area (18, 18a, 18b); wherein the mobile electronic terminal device comprises: a light-sensitive receiver for receiving the light transmitted by the illumination means in the limited spatial area (18, 18a, 18b); a demodulator for demodulating the light received by the light-sensitive receiver and for retrieving the data encoded to the light; a storage device for storing reference data with regard to the limited spatial area (18, 18a, 18b); and a data processing unit having one or a plurality of programs for generating output data by the data processing unit as a function of the reference data and the data retrieved by the demodulator, wherein the output data indicate at least an approximate spatial position (1a,..., 1f) of the illumination means in the spatial area (18, 18a, 18b) or details for navigating from this spatial area to a navigation target within the spatial area (18, 18a, 18b) specified by the reference data. characterized by an illumination means, and a mobile electronic terminal device, in particular a Smart-Device, at least one light source; and a modulation device for modulating the light transmitted by the light source; wherein the modulation device is configured, by modulating the light transmitted by the light source, to encode data to the light which data contain a unique identification of the illumination means or identify a spatial position of the illumination means within the limited spatial area (18, 18a, 18b); wherein the mobile electronic terminal device comprises: a light-sensitive receiver for receiving the light transmitted by the illumination means in the limited spatial area (18, 18a, 18b); a demodulator for demodulating the light received by the light-sensitive receiver and for retrieving the data encoded to the light; a storage device for storing reference data with regard to the limited spatial area (18, 18a, 18b); and a data processing unit having one or a plurality of programs for generating output data by the data processing unit as a function of the reference data and the data retrieved by the demodulator, wherein the output data indicate at least an approximate spatial position (1a,..., 1f) of the illumination means in the spatial area (18, 18a, 18b) or details for navigating from this spatial area to a navigation target within the spatial area (18, 18a, 18b) specified by the reference data. a light-sensitive receiver for receiving the light transmitted by the illumination means in the limited spatial area (18, 18a, 18b); a demodulator for demodulating the light received by the light-sensitive receiver and for retrieving the data encoded to the light; a storage device for storing reference data with regard to the limited spatial area (18, 18a, 18b); and a data processing unit having one or a plurality of programs for generating output data by the data processing unit as a function of the reference data and the data retrieved by the demodulator, wherein the output data indicate at least an approximate spatial position (1a,..., 1f) of the illumination means in the spatial area (18, 18a, 18b) or details for navigating from this spatial area to a navigation target within the spatial area (18, 18a, 18b) specified by the reference data.