I have no intention at all in trying this or the other skilled modes right now, but I am curious as to how it behaves since the manual wasn't as descriptive as I would have liked. How does sport mode include altitude assistance exactly, when there is still full control (no automatic help) for pitch and yaw? For example, how can it automatically maintain altitude (or provide altitude assistance, rather) if I'm flipping it sideways etc.? What happens if it's in midair, and I release all controls, assuming zero wind? It does not level off but maintains altitude? Doesn't make sense to me. In that case it would zoom in the direction it's still tipped, just to maintain altitude. From the manual: Sport mode in a modified version of Acro that includes altitude assistance and earth-frame orientation. With altitude assistance, the throttle stick behaves the same in Sport as it does in standard flight (Fly mode). Earth-frame orientation differs from copter-frame orientation in that the direction of yaw rotation is in relation to the earth instead of in relation to the copter itself. For example, if Solo is pitched forward in Sport mode and left yaw is applied, Solo maintains the same pitch angle and rotate around the vertical axis. This differs from Acro’s copter-frame orientation, in which, in the same situation, Solo performs a cartwheel. Sport does not require GPS lock.