Leo dropped the phone.
That’s when his son, Marcus, a robotics engineer in Seattle, installed EchoLocate on an old Android phone. “It’s not GPS, Dad,” Marcus explained over the phone. “GPS tells you where you are . This tells you where you’re going .” sonic maps android
The phone was a brick—a ruggedized, matte-black Samsung Galaxy XCover Pro. Marcus had stripped it of everything except the battery, the speakers, and a custom array of ultrasonic microphones. Leo dropped the phone
Leo tapped. The phone didn’t talk. It sang . a robotics engineer in Seattle