Designed for recreational boaters, fishermen and divers. Waterproof Charts are beautifully printed on synthetic paper. You can use them on deck in any weather, rain or spray! Accurate used by the Coast Guard and Navy, and simple to use with GPS. Foldable and easy to hold and store Waterproof Charts are so tear resistant you can't ruin them. Printed on both sides so they save you money! Fish / Dive charts contain dozens of plotted positions of interest. Also available in large print, in some areas, for easier reading.