The Intracoastal Waterway (ICW) West Closure Complex acts as a HUGE magnet that can affect the autopilot and magnetic compass of boats. Located west of the Algiers Junction Light and the Harvey Lock, it is identified in navigation aids as a "Huge magnetic field, steer manually", "Mystique: Floodgates", "Don't use magnetic autopilots here".
It's true purpose is to act as a floodgate to prevent storm surge from causing damage to local towns.
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