This is a vintage navigational map / chart - # 11428 Okeechobee Waterway - St. Lucie Inlet to Fort Myers and Lake Okeechobee.  19th Edition - Sept 28, 1981.   If laid out flat, the chart measures 20" by 58 1/2".    It folds up to measure 10" by 5".   Good condition.    Shipping is $7.00 if within the USA.    Check out my other items.    I have quite a few different navigational charts listed.   I have quite an eclectic mix of interesting items listed, and am always adding more.  Please add me to your favorites list.