And let's talk about recent wrecks at the Brodak's contest where stunt planes in flight struck objects. Not sure you saw the wrecks, but I know I witnessed them.
The field is a challenge. It has some different slopes to it. The centers are typically marked with paint. Metal poles are driven into the ground at a measured distance from the center adequate for pilots that are able to find the paint marks and have lines within contest specs.
The wrecks into the poles happened when pilots "wandered," meaning they were not at the specified center. To be at the center, the pilot either needs to start/remain there, or find their way there. Typically, this involves looking for the marks visually, taking some attention away from the demands of getting a good score.
A safer alternative, especially at the start of the flight, is to immediately climb to an altitude that is adequate to avoid people and poles, making sure any person launching didn't stumble or get distracted, then making sure to take the time to focus on finding the circle's center. Once happy the circle is 100% safe for 4-6 foot flying, the rest of the flight commences. This style of flying is less demanding and suitable for a variety of flyers, especially seniors and sport flyers in crowded urban settings. Many combat fliers fly this way on their first lap.