Asteroid orbital drift chart

Asteroid orbital drift charts were computer-based simulations of the movement of various bodies that occupied an asteroid field. Stored in a navigation computer, orbital drift charts formed a part of a ship's astrogation capabilities, allowing it to navigate an asteroid field safely.

The Peragus Mining Facility's command console stored asteroid drift charts that were constantly updated, allowing the console to send out transmissions to incoming crafts to prevent them from being crushed into space dust. Prior to the transmission of orbital drift charts, the Peragus console automatically hailed incoming ships, usually freighters, to warn them to maintain distance as well as to send them docking instructions

When the Republic warship Harbinger arrived at the Peragus Mining Facility, where the Jedi Exile and her freighter, the Ebon Hawk, was trapped in, the exile and her companions, Atton Rand and Kreia, boarded the Harbinger and stole the drift charts to the Peragus asteroid field stored in its navicomputer, bringing them to the Ebon Hawk and making their escape.

Text and facts from the “Asteroid orbital drift chart” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.