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Watch the inboard part of these active fin stabilizers moving while underway in the ICW near Palm Beach, FL. See the arm move and note the hinged arm and blue button pin to LOCK it in an emergency. Of course it is not moving fast in the ICW, guess what it will do in the ocean! Learn more, register for our Boating Systems or Cruising 101 FUNdamentals course in Vero Beach, FL. https://www.CaptainChrisShipStore.com Ask Captain Chris 772-205-1859