Field Notes Coastal East three (3) pack reveals the Atlantic coast from Main to the tip of Florida which you can line up using the three books.  The two holographic foils can appear to be almost any color, although they start as a deep gold on the shore and a rich, aqua blue in the water. And if you happen to be landlocked, open one up and hold it to your ear: you’ll hear the ocean!  We just tried, it totally works.