Blind Runner / marathon device for the blind

When the blind participate in the marathon, they had to run with their guide runner.
Using 'Blind runner', they could run an entire marathon alone.
The blind could get information about space perception by using it. Realtime analysis is offered by laser range finder of this. And they can recognize distance and position between person by gradual sound system. and vibration alarming is given to them when other is too close.
convenience(water station, medical point...) and course information is offered by voice announcement.