[HighPlainsDrftr]

Think about it this way. They didn't have temperature sensors and wind gauges setup every 20 ft along the path to the target.

Someone said, "How can I do this." It's not that much different than saying "I'll jog around the block." Couple weeks later "I'll jog around the block in half the time when I started." Weeks later "I'll jog around the neighborhood."

It is a hobby. It is complex. Someone made it happen.