This device is the pinnacle of technology in boating. Much like Google Glass (but arguably with way greater usability) the Nautix In-view Display clips to almost any set of glasses or sunglasses. It will provide you with critical boat data like depth, speed, bearing, and water temperature. Great for boater who might not have duplicating charter plotters or for knowing your depth while you pay out your anchor rode. Available from Garmin for $400.