The 7x30 Navigator Pro weighs only 18 ozs. and incorporates the exclusive Steiner Sports-Auto-Focus system. Once set for the user’s eyes, the binocular keeps all objects in focus at distances from approximately 20 yards to infinity. Because of the greater depth of focus field in the Poro-prism, 7x30 Navigator Pro, the focus feature allows boaters to scan an entire seascape without having to readjust the focus wheel. It can also be faster in locating navigational marks, harbor entrances, boats and other man made objects when used in conjunction with the integral compass.