I use Imray C series and get them laminated by a local printer. This makes them stiff and easy to use in the boat and very hardwearing. To store them I just roll them and stuff them between the slats in the seats – crude but it works and they are easily got at. The snag is the price and its difficult to update them. If I was in just one area ie one chart this is a good method to use but I do like the idea of printing them myself on waterproof paper. Its about £20 a go to laminate them!