Ideal for runabouts, center consoles, flats boats and more. 2-1/4" direct reading dial. Built-in compensators to correct for deviation. Built-in 12 volt green NiteVu lighting. The TR31 models feature a fully adjustable and reversible bracket that allows a mounting range of over 300° from over head, through angled and vertical mounts to horizontal surfaces. Exclusive 5 year warranty.