A mast system for use with a sailing vessel including a flexible mast connected to a first point of the sailing vessel; a tether connected to a second point of the sailing vessel, the tether being further connected to the flexible mast, wherein the lengths of the tether and the flexible mast are sized to pull the flexible mast into an arch.

A mast for a rig for a surfboard is characterized among others by the following features: a mast with a profiled cross-section in the longitudinal direction, said cross-section being formed transversely to the mast longitudinal direction and deviating from a circular shape; the profiled cross-section has the shape of a droplet or has a droplet-like design in the manner of a droplet profile; the mast has a fork tree head securing section which can be rotated or pivoted about the fork tree head securing section; the fork tree head securing section is provided with a cross-section which deviates from the droplet profile; and the mast lower part and the mast upper part of the mast consist of plastic or comprise plastic optionally with the addition of a reinforcement consisting of metal, glass fibers, and/or carbon fibers.

A steering assist system for a sailboard includes on-board steering assist apparatus and an information processing apparatus. The information processing apparatus specifies a recommended movement direction or a recommended sail direction, based on a movement direction and a movement speed with reference to a movement history of the sailboat, and transmits it to the on-board steering assist apparatus. The on-board steering apparatus receives the recommended movement direction or the recommended sail direction, and display it.

A mast for a rig for a surfboard is characterized among others by the following features: a mast with a profiled cross-section in the longitudinal direction, said cross-section being formed transversely to the mast longitudinal direction and deviating from a circular shape; the profiled cross-section has the shape of a droplet or has a droplet-like design in the manner of a droplet profile; the mast has a fork tree head securing section which can be rotated or pivoted about the fork tree head securing section; the fork tree head securing section is provided with a cross-section which deviates from the droplet profile; and the mast lower part and the mast upper part of the mast consist of plastic or comprise plastic optionally with the addition of a reinforcement consisting of metal, glass fibers, and/or carbon fibers.

The invention relates to an inflatable rig for wind-powered sports equipment and a sailing rig set comprising such rigs.