“…In fact, the ideal aid should support all tasks in the O&M process. Navigation aids have attracted most of the attention, from simple ultrasound devices that report the presence of obstacles as they approach, to sophisticated systems based on a combination of GPS, GIS and Web cybercartography (Bartyna et al, 2005;Punwilai, Noji, & Kitamura, 2009;Wang, Li, & Li, 2012;de Almeida & Tsuji, 2005;Sanchez, Aguayo, & Hassler, 2007); advances in the field of robotic navigation have also been tested as navigation aids for blind people (Knight, 2012;Kaiser & Lawo, 2012). There are two main groups of navigation aids.…”