I like your idea but as vizs go it's a bit misguided. Something 4 rings out in one direction and 5 rings out in another would be hard to compare at a glance. In

I like your idea but as vizs go it's a bit misguided. Something 4 rings out in one direction and 5 rings out in another would be hard to compare at a glance. Instead you could make a directionless viz that's basically a bar graph that's just as useful if your primary concern is distance in minutes.