The Garmin Silva Compass is perfect for small to medium craft. The unit comes with 12v light and adjustable bracket especially designed for marine navigation. Extremely popular with powerboats as it allows quick and easy mounting in several locations on the boat. And great for boats with awkward angles, it can also be taken away and stored safely after use. The Garmin Silva 58 is a liquid compass in which the magnetized needle or card is damped by fluid to protect against excessive swing or wobble, improving readability while reducing wear especially on boats.