If you straighten your index finger then yes, if you hold it close, you make a fist
Those big white arrows mean that you moved between "cells" on the map. Initially I wanted to display coordinates as well which would make it clearer but they didn't look good. They are just an information.
Device to exchange weapon is indicated by two arrows (blue and red). Upgrade machine looks like three yellow "i"s. The map is never explained at the moment but will be.