This device is responsible for keeping track of a TARDIS's dimensional location. It uses the Interstitial Antenna to collect data from the Vortex. A TARDIS knows where it's going by using digitally-modelled time-cone isometry parallel-bussed into the image translator, with local motion being mapped over every refresh-cycle. This information is displayed on the Gyro-Series Dials. It will detect time travel induced by exterior forces (even if the TARDIS's drive is not activated). It is possible that a TARDIS occasionally materializes in space to "get its bearings."
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.