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Portland Charts and World Maps of the World
The name portland chart seems to have been coined centuries after the charts them es mostly fell out of use. Portland charts were mostly used in europe from about 13 hundred to 15 hundred. They worked pretty well for navigating around bodies of water like the mediterranean sea or the black sea, or the atlantic coast of europe. As european navigators started voyaging farther away, in the sixteenth century, portland charts were expanded to include information they brought back about the coasts africa, asia and the americas.