Your sea vessel doesn't care whether it's night or day, and neither should you. Flir's powerful Navigator II thermal imager makes pictures from heat - not light -áso it's easy to see floating debris, channel markers, and other boats in total darkness and reduced visibility. Navigator II perfectly augments your other onboard electronics, verifying radar returns and seeing things in the water that radar might miss. Thermal imagers are the best search and rescue tools around in the situation of someone falling overboard. Automatic image optimization requires no adjustments from the operator to reveal outcroppings of land, channel markers, and obstructions. Wide 36║ field-of-view lens provides excellent situational awareness for navigation. So simple to operate that if you can watch TV, you can operate a Navigator. Works with most multifunction displays. Plugs into existing video displays with standard video connections. 12V DC. Fixed Navigator II: 7.3" x 4" x 7.4".