the navigation system has a recommendation but you'll be hard pressed (9.8 m/s/s) to follow it's saying: young Icarus, you must go at least a little toward the heavens (and we mean the unknown as much as you do) by pulling back on the yoke (wheel in airplain Eng.) and putting those feathers you've been growing to the work they desire: a practice in up, up, down, up thermally efficient, laws and edicts send you to the sky but remember don't get to(o) high and we'll be there yet