The fruit of 8 years of research in collaboration with the CNRS, ANGEO is the only device capable of discretely, reliably guiding you when crossing areas where GPS satellites are masked. When Apple introduced the iPhone 3GS in 2009, it was the first ever touch screen device accessible to the blind. iOS device usage has steadily increased among the blind and visually impaired population and numerous GPS apps targeting this user group have been developed since. Ariadne GPS, developed by Luca Giovanni Ciaffoni, was released in June 2011 and was one of the first GPS apps specifically designed for blind and visually impaired users. It is based on Google map data and has the following features:  BlindSquare is developed by MIPsoft and was first released in May 2012. It uses data from Foursquare and OpenStreetMap and offers a large feature set covering the needs of blind and visually impaired travelers. It is based on Foursquare, Open Street Map, and Apple Maps data and supports the following features:  iMove has been developed by EveryWare Technologies and was first released in January 2013. It is unique, because it lets users record sound clips and associate them with saved locations. iMove offers the following features:  MyWay Classic was first released in January 2012 and is developed by the Swis Federation of the Blind. It has evolved into an app with a large set of features covering the needs of blind and visually impaired travelers. It uses Open Street Map data and includes the following features:  Seeing Assistant move is developed by Transition Technologies S.A. and was first released in March 2013. It is the only GPS app designed for blind and visually impaired people that lets the user operate the app through predefined speech commands. It is based on Open Street Map and supports the following features:  Sendero Seeing Eye GPS is developed by the Sendero Group in collaboration with several organizations for the blind (Seeing Eye, RNIB, Guide Dogs NSW ACT) and was first released in July 2013. The Seeing Eye GPS is a fully accessible turn-by-turn GPS iPhone app developed by Sendero Group. It has all the normal navigation features plus features unique to blind users, such as simple menu structure, automatic announcements of intersections and points of interest, and routes for both pedestrian and vehicle with heads-up announcements for approaching turns. It uses Foursquare and Google Places for points of interest and Google Maps for street info. Seeing Eye is not available globally and is offered under various names: The Sendero apps include the following features:  ViaOpta Nav is developed by Novartis Pharmaceuticals Corporation and was first released in August 2014.