Abstract: A display on a boat's dash enables the driver to display desired data in easy-to-read format while the boat is underway. Two screens adjacent to each other are separated by a mullion. In its initial state, the display shows a speedometer split across the screens. Additional data can be displayed on the screens along with the speedometer portions. The boat driver presses a button on the display causing the speedometer to move to the left and in doing so the speedometer portions appear to move together under the mullion to form a whole speedometer on the left screen. Moving the speedometer to one screen frees display area on the other so that additional or different data can be displayed. By pressing certain buttons on the display any already-displayed additional data may remain on the screen or disappear, and different additional data may be added to the screens.