Steiner 7x50 Commander XP with Compass Binoculars The most important innovation in the Commander XP are the XP Optics; a new high definition, broad band optical formula that features record setting light transmission for times in the dark and clear, sharp, high contrast and comfortable images in daylight. In addition to the XP Optics, is a new high-tech optical coating on both the objective and eyepieces called ''NANO Protection''. This new coating repels water and moisture off the lenses leaving them clear of water or moisture. Like windshield wipers for your binoculars, you won't ever have to wipe them clean of moisture. The secret lies in a unique permanent molecular bonding substance that makes the lenses so smooth, that absolutely nothing adheres to them. You sail along the coast and see in your map the height of a lighthouse in front of you is 40 m. You find the lighthouse and the number scale of the reticle show a current height of 20 meters. The distance to be calculated is the actual size, 40 m in our example, divided by the read size, 20 m in our example, multiplied by 1000. 40 m / 20 = 2 x 1,000 = 2,000 m. Thus, the lighthouse is at a distance of 2,000 m. A second example for the horizontal scale: You see a port entrance in front of you. You know it is 80m wide. Now you apply the portside light of the harbor on the left side of your reticle and read for the starboard side light a value of 60. The distance to be calculated is the actual size, 80 m in our example, divided by the read size, 60 m in our example, multiplied by 1,000. 80 m / 60 = 1,3 x 1,000 = 1,300 m. Thus, the lighthouse is at a distance of 1,300 m. 7x50 Advantage — The 7x magnification and larger 50mm objective is the standard for marine binoculars. It produces a wide field of view making it easy to track other boats, navigation buoys and bridge numbers even in rough water. The larger image also reduces the need for stabilized images.