This device takes the Space-Time Coordinates for departure and arrival and converts them into Epsilon Coordinates for travel through the Space-Time Vortex. The Epsilon Coordinates serve as a path through the Space-Time Vortex allowing a TARDIS to avoid any unknown regions or areas of intense time spillage. A fully functional Directional Unit is essential for precise navigation and landings. A TARDIS that missjumps often find itself at a Temporal Nexus Points (a time zone where history is easily changed). In practice the Directional Unit is accurate down to about 3 meters or so. The shorter the trip, the simpler it is to calculate the Epsilon Coordinates. Executing a short hops, however, have other difficulties. There are some locations that can only be reached by traveling through dangerous areas of the Vortex. Using Manual Override, a course can be plotted to these locations. A directional unit from a Mark IV TARDIS Console will burn out after one use in a Mark I Console.
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, author's speculation, and popular fan belief.
Copyright Will B Swift
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