In answer to a recent question: Ice Dancer II, a 57 Nordhavn, has TRAC stabilizers that were manufactured by American Bow Thruster. The system is digitally controlled with hydraulically powered, active fins. It has a good reputation for reliability, and so far has performed without failure. We engage the system whenever the boat is in operation. At rest, pins are inserted to prevent currents and gravity from moving the fin blades. At very low speeds or in reverse gear, fins are centered to prevent damage from surge. Ice Dancer (I), our previous 50 Nordhavn, had Koopnautic stabilizers. This system was constructed for larger boats, but was installed on the 50 for high reliability. It seemed to have a more sensitive control system, but not materially different in performance from the TRAC. Dick and Gail Barnes Aboard Ice Dancer II 40 miles south of Antofagasta, Chile 1/1/07 24 17S lat. 070 34W long.