Printed on both sides, these charts save you money! And because they are printed on synthetic paper, they are impervious to water, fresh or salt, so you can use them on deck in rain or spray. Convenient size 25"H x 38"W makes them easy to fold and store. Used by the Coast Guard and the Navy, these charts are updated regularly and include Loran and GPS coordinates on most charts. Special editions for fishing and diving Exact positions for wrecks and reefs Large print editions have larger type and brighter colors All editions now contain information on obtaining free updates