Covers the entire Mississippi river as it runs from its source in northwestern Minnesota to its mouth in the Gulf of Mexico. Included are all Coast Guard aids to navigation used for general navigation such as lights, sound signals, buoys, day beacons and other aids to navigation. Not included are Coast Guard mooring buoys and some buoys having no lateral significance, such as special purpose, anchorage, fish net and dredging. This publication and the data contained within it is maintained by the USCG and published with permission by Clipper City Publishing, Inc. new editions are published every 2 years (biannual). 8 1/2" x 11".