a chart is the name for a map of the sea. These charts show things such as the depth of water, the kind of bottom, the location of wrecks, submerged rocks, the tides and currents and where applicable, the coastline and its features. Charts are kept in a chart room which is usually located close to or on the bridge. See also bridge in this glossary.—Welcome to the SO Glossary Final approval 2-Mar-90