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Mitsubishi uses sound and WiFi to locate you indoors

You might never get lost in the parking garage again.
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There have been many attempts at locating you indoors when GPS fails, but they usually come with catches. WiFi alone isn't very accurate, for example, while a ton of beacons isn't always practical. Mitsubishi may have a good answer to those problems, however: using two techniques at once. It just developed an approach that determines your location based on the time it takes for sound to reach positioning-capable WiFi access points. It's accurate to within 3.3 feet, and it works with as few as three hotspots -- which, of course, can get you online at the same time as they get you from A to B.

As you might guess, a major car maker like Mitsubishi primarily sees this helping out in parking garages. The sound-plus-WiFi approach would help you find a free space when you're driving in, and find your car when you're ready to head home. This isn't just a theoretical exercise, either. The company expects real-world use by April 2017, so the days of getting lost in a concrete maze might soon come to an end.

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