WASHINGTON — John Hessler, mathematical wizard and the senior cartographic librarian at the Library of Congress, slipped into the locked underground vaults of the library one morning last week.

In the last third of the 16th century, the Spanish crown set in motion a project to obtain a complete map of the New World. The method thought up for this was to use surveys, known as Relaciones ...

To safely navigate inland waters, big ships and other vessels helmed by professional mariners use nautical charts produced by the government in the U.S. and Canada. Charts – the proper name for ...

TCart a has introduced a new line of Satellite Reconnaissance Charts designed to complement official marine navigation maps in shallow waters. These digital maps, derived from recently acquired ...