used to keep the luff of the sail “on edge” – the luff just curling.
best thought of as the angle it makes to the Apparent Wind Direction.
Pole Heel Lift – the track slider which controls the inboard end of the pole,
keeping the pole level after changes to the outboard end (not on all boats)
Mainly used to control the spinnaker in strong winds.
vertically moving the “tack” of the spinnaker.