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TopThere have been a number of research projects that can help the visually impaired navigate in unfamiliar indoor environments (Horowitz, 2003; Noor, HIsmail & Saaid, 2009; Chumkamon, Tuvaphanthaphiphat & Keeratiwintakorn, 2008; Ki Giampaolo, 2010; Ganz, Gandhi, Wilson & Mullett, 2010; Darvishy, Hutter, Früh, Horvath & Berner, 2008; Coughlan & Manduchi, 2009; Ivanov, 2010; Bostelman, Russo, Albus, Hong & Madhavan, 2006; Fernandes, Costa, Filipe, Hadjileontiadis & Barroso, 2010; Manduchi, Kurniawan & Bagherinia, 2010; Brilhault, Kammoun, Gutierrez, Truillet & Jouffrais, 2011). Most of these systems design and use new devices for their users, which mean extra cost. One of the prominent projects that underwent user trials with 24 visually impaired subjects is the PERCEPT project (Ganz et al., 2011) funded by the National Institutes of Health/National Eye Institute. PERCEPT uses passive RFID tags (R-tags) deployed on different landmarks in the environment. PERCEPT user interacts with the environment using a glove and a Smartphone. Upon touching the R-tags using the glove, PERCEPT server through the Smartphone provides navigation instructions to the visually impaired users. More details on the system can be found in Ganz et al. (2011).