i don't know the difference but one drawback to the powerdrive i purchased 3 years ago is that the copilot doesn't work with the autopilot for small adjustments in direction the foot control does though. the cord is long enoung to reach the back deck on my 16.5 ft boat and i use it when fishing from back of boat, " only used trolling cranks". Also the maximizer speed control is limited with copilot remote. Now i don't know about terranova