Along comes Intelliboat Ladder Sensor. This small, smart, device provides a visual and audible warning if the ladder is down when the ignition key is switched on. Installation proved easy. First, find a spot at the helm for the compact, weather-resistant 2-1/2” x 1-3/4” display. Next, drill a ¼-inch hole for the wires and connect so that the device is energized when your ignition key is turned on. Next, peel the backer off the special 3M tape and press in place.