Approximate Cotidal Lines of the Pacific Coast of the United States

Chart of the Pacific Coast showing co-tidal lines, co-tidal hours, bathymetry, and tidal stations from San Diego to Straight of Juan de Fuca. Explanatory notes and a legend are also shown. IMPORTANT NOTE: All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and flattened using humidity baths, semi-permeable membrane, and drying blotter techniques. Most others you typically see on eBay have not been, and worse, are quickly and crudely unfolded for the low-quality photos you see. Unfolding these maps in that way is damaging and weakens them. Please be aware.