Active heave compensation (AHC) is a technology used in offshore operations, such as drilling or subsea exploration, to stabilize a vessel and its equipment in response to waves and other disturbances in the ocean. AHC works by using hydraulic cylinders or other mechanisms to counteract the motion of the vessel, compensating for the heave, pitch, and roll caused by waves or currents. The system uses sensors to measure the movement of the vessel and calculate the necessary compensation, which is then applied to the equipment or payload using winches or other lifting devices. AHC is important for maintaining the safety and accuracy of offshore operations, as well as minimizing damage to equipment and reducing downtime due to weather or sea conditions.