RedactedNarrative: V1 sailing north off shore in state waters went to tack/turn to get a new bearing on the wind.  Vessel did not turn completely. Dingy which was being towed behind vessel overturned and acted as a sea anchor.  Vessel was almost capsized by a large wave and operator fell into water.  By the time the operator had returned to the vessel and cut loose the dingy, the vessel was in the surf and grounded on the beach