A woman holds up her cell phone as she plays the Pokemon Go game in Lafayette Park in front of the White House in Washington, in 2016.
The Google-developed Sodar tool available this week taps into Android smartphone cameras to put users in the centre of a white circle with a radius of about two metres. Circles superimposed on surroundings move with users, keeping smartphones in the centre. Users get a visual warning when they are within the potentially hazardous radius.
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