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Over the last decades, the development of navigation devices capable of guiding the blind through indoor and/or outdoor scenarios has remained a challenge. In this context, this paper's objective is to provide an updated, holistic view of this research, in order to enable developers to exploit the different aspects of its multidisciplinary nature. To that end, previous solutions will be briefly described and analyzed from a historical perspective, from the first "Electronic Travel Aids" anddoi:10.3390/s19153404 pmid:31382536 pmcid:PMC6696419 fatcat:3i7uedssqbe63gdgplimfrsfc4