Kenshutsu-ki

These are the green radars that are distributed to the first 100 contestants that ascend the right staircase shaped like hexagons that measure the distance between the user and the person with the red sonars by meters to miles. The farthest that these radars can track the sonars is close to 500,000 meters which is 300 miles apart from one another and they measure in all directions (North, NE, East, SE, South, SW, West & NW).