Your teleport system has been upgraded through your explorations of Cap au Diable. You can now add a beacon to take you there.
How to Get
One obtains the Cap au Diable Beacon supergroup badge by visiting all six Cap au Diable exploration badge locations while in supergroup mode.
Note that visiting these locations while not in supergroup mode will not advance towards earning this beacon badge, even though it will earn the personal exploration badge for that marker.