Google's VPS indoor navigation is a game-changer for the visually impaired

Everyone knows how useful GPS is for navigating the world outdoors, but what about indoors?
At its Google I/O developers conference, Google announced a new technology called Visual Positioning Service (VPS), a Tango-enabled mapping system that uses augmented reality on phones and tablets to help navigate indoor locations.
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Imagine holding up your Tango-ready phone inside of, say, a large warehouse-like store like Lowe's or Ikea, a