n.a raised openplatform or deck on a ship, from which visual communication is maintained with other ships in the vicinity. The signal bridge is equipped with an assortment of signaling apparatus, including special flags, flashing lights, as well as the ship's bell which is used to give audible signals to other ships and to indicate time of day. It is usually located near the navigating bridge, that room on a ship from which the captain controls the ship's course.a platform above the main deck of a ship from which visual signals are made.