Hawke Sport Optics Endurance ED Marine Monocular - 7x42 - For over a decade, Endurance ED optics have been renowned for incredible performance and reliability. Now, with the introduction of the Marine range, we have grown upon this award winning selection with optics that are specifically designed for marine and boating applications. With a range of models to choose from, the Marine Optics family feature binoculars and monoculars to suit any requirement. Advanced BAK-4 roof prism optical systems make far more compact, modern and lightweight optics than the industry norm.