Electronic apparatus for navigation assistance, namely, satellite-aided navigation systems, inertial navigation systems, radio navigation systems and obstacles avoidance systems primarily comprised of sensors for measuring proximity to objects and GPS navigation devices for disabled or non-disabled persons; software for collecting, processing and fusionning data from distance and inertial sensors; electronic apparatus for navigation assistance, namely, obstacles avoidance systems using ultrasound primarily comprised of sensors for measuring proximity to objects and GPS navigation devices; navigation aids, namely, satellite-aided navigation systems, inertial navigation systems, radio navigation systems and obstacles avoidance systems primarily comprised of sensors for measuring proximity to objects and GPS navigation devices for disabled or non-disabled persons; mobile apparatus, instruments and equipment for data processing, namely, computers, computer hardware, data and digital signal processors, inertial sensors, GNSS receivers; mobile apparatus, instruments and equipment for the transmission, reception, processing and reproduction of sound, ultrasound or other signals; mobile apparatus, instruments and equipment, namely, computers, computer hardware, data and digital signal processors, inertial sensors, GNSS receivers, electronic proximity and distance sensors, positioned on a body limb or a cane for the processing of data from surroundings, not for a medical purposes; apparatus connected to mobile telephones or tablet computers, namely, electronic sensors and computers, earphones and loudspeakers; apparatus connected directly or via an intermediate apparatus to the Internet, namely, computers, tablet computers, and mobile phones; computer software applications for mobile phones or tablet computers, namely, electronic travel aid software for disabled or non-disabled persons that provides directions, point-of-interest information and obstacles avoidance