You ever have one of those days where you just had three ideas at once? Today mine was on umbrellas. Happy GURPS Day!
Umbrella-chute (DX/Easy)
Defaults: DX-4, Parachuting -2
This is the ability to maneuver and land while using an umbrella as an improvised parachute. This skill does absolutely nothing to reduce velocity; use an appropriate spell or power for that. What it can do is allow the user to aim for a precise landing zone on the ground, and to avoid injuries from a bad controlled landing.