What is "boardsailing"

Usage examples of "boardsailing".

Through the clear window of the sail he studied the orange buoy marking the final windward leg of the thirty-mile boardsailing marathon race around Biscayne Bay to the Cape Florida lighthouse on Key Biscayne.

Through the clear window of the sail he studied the orange buoy marking the final windward leg of the thirty-mile boardsailing marathon race around Biscayne Bay to the Cape Florida lighthouse on Key Biscayne.