http://glassalmanac.com/paragliding-glass-app-making-flight-safer/6756/

The app displays a map that tracks the wearer’s path during
flight, as well as showing necessary flight information such as the pilot’s rise
and sink rates, current altitude above sea level, and ground speed. This leaves
the pilot’s hands free to operate the glider.

Locations of potentially dangerous cables, such as ski lift cabling and power
lines, are plotted on the map in red. If the pilot ventures too close to a
dangerous area, Glass provides visual and verbal warnings as well as what
direction the hazardous area is located so the pilot can steer away from danger.