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So, stupid question from someone who has never gone skydiving or anything of the sort: how exactly does one "move" laterally?

I imagine it's by deflecting various parts of one's body, using them in a manner akin to flight control surfaces. But which ones? What's the short version for idiots?

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The tracking position - face-down, straight legs, arms by your side - lets you move head-first at very high speeds. There are claims of achieving a 1:1 glide ratio. https://en.wikipedia.org/wiki/Tracking_(skydiving)

As a student I've mistakenly jumped out of a plane quite far from the DZ and managed to track most of the way back during freefall (and flew the rest under canopy).

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