Keep your charts secure and dry. The NRS HydroLock Map Case helps you navigate with ease. Just fold your map to the right section, seal it inside, secure it to your boat, and go! Read More Four sizes to accommodate most maps, charts or books, as well as essentials such as wallets, snacks and a warm hat. The HydroLock zip seal provides a totally waterproof closure. Periodically clean the sealing surfaces and lubricate with 303 Protectant, Item # 38751.01, for ease of closure. A clear urethane window lets you see both sides of your map, chart or guide. Attachment points in the corners make the NRS HydroLock Map Case easy to lash to your boat or a deck bag so it's always right there when you need it. Filled & Rolled Dimensions: Available Sizes Material: Urethane Closure System: HydroLock zip seal
