Convenience Our Òflip-foldÓ charts are easy to manage. Spread the chart out to its full width, or keep it folded and flip to your favorite area. Quality MaptechÕs charts are printed on high-quality, waterproof, synthetic paper. Chart images are crisp and easy to read. Value The extensive coverage in just one Waterproof Chart will save money compared to the cost of multiple charts to cover the same area.