A star chart is any mapping of three-dimensional space, usually undertaken by the stellar cartography department of a starship, retrieved and edited there or in astrometrics laboratories for navigation purposes.
In 2367, Doctor Beverly Crusher became trapped in a static warp bubble. With "her" universe shrinking, the USS Enterprise-D computer stated it had no record of Tau Alpha C on any current star map. (TNG: "Remember Me")
In 2368, Captain Jean-Luc Picard began to live the life of Kamin on the planet Kataan after the Enterprise encountered a spaceborne probe. During this time, he created several star charts of the stellar region surrounding Kataan with the help of a telescope he had constructed. (TNG: "The Inner Light")
In 2372, after Tom Paris' transwarp flight, his shuttle, the Cochrane collected over five billion gigaquads of information. Captain Kathryn Janeway told Lieutenant B'Elanna Torres to transfer the data to stellar cartography, so a star chart could be created. (VOY: "Threshold")