You answer:

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?