Posted on 02/06/2016 2:24:34 PM PST by Rebelbase
I would only do that in a T-16. After bullseyeing a womp-rat.
Kidding aside -- jumpers have instrumentation that record rate of fall, speed, time, etc. The jumper knows his/her glide ratio ahead of time and plots it on a topo before jumping.
First jump are usually made from an airplane while one learns to control your suit (control surfaces) and parachute (brakes).
Common places to jump are known ahead of time and don't need calculation for every jump. Much like a golf.
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