Mike,
The problem is that some have used their smart phone app to access the latest radar wx, and headed straight for a developing thunderstorm, then ran under the storm exchanging lift for speed. This tactic is legal, but very foolish and dangerous because you always run the chance of being sucked into the storm...................but wait, the smart phone also has an app that provides an artificial horizon, problem solved! This tactic works best in a 2 place sailplane with instrument rated pilots. The GIB (guy in back) directs the show while the nose gunner flies instruments.

I fear allowing unrestricted smart phone use has unlocked the candy store, but failed to activate the security cameras.
:) JJ