Precision in Skydiving Planning & Ground Work

In skydiving, every small calculation is important—altitude, wind, speed, gear. One mistake can make big problem. It is little same like material takeoff in construction, where small detail change whole project. I also share some of my work on https://tylerestimating.com/
where I talk about planning. I want to ask, how you prepare before dive, special for big jumps or group formation? What tools or tips you use for safe and correct jump?

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