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The GMCO mission is to provide our customer with the most accurate, informative and useful maps and charts for the waters that we publish. Whether you are a beginning boater, an experienced cruiser, recreational fisherman, or a top tournament angler, GMCO maps aim to provide the important information you need while on the water.GMCO went back to the old ways to obtain information on the waters and the surrounding areas: Spending time on the water and working with the local experts. of each area. Using guides, charter boat captains, and local expert knowledge GMCO maps provide you with the important and useful information that avid tournament anglers require in a simple format the first time boater can use.