These contain the stellar maps and navigation data, which can be used by the operator in conjunction with the Astral Map to set the coordinates. The Information-Banks' Location Finder can be used to export coordinates to the Directional Unit. There is a large bank of flight computers that house the TARDIS Journey Logs. These logs automatically store data related to the TARDIS's navigation through the vortex. Each space-time jump is given a journey reference number for easy recall. Using the Fast Return Switch information can then be recalled and fed into the Directional Unit to return to a previously visited time zone. The autolog indicator light will be lit when a TARDIS is relying on this data Journey Logs. Journey Logs of the flight computer are near impossible to alter (i.e. forge a false entry) but are easy to wipe.
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.