Space-time locator
From Tardis Wiki, the free Doctor Who reference
The space-time locator was a mechanism used in TARDISes to plot courses through space and time. It could be damaged by vibration caused by a TARDIS's dematerialisation being too abrupt.
The space-time locator in the Doctor's TARDIS was damaged when the First Doctor departed from Skaro. (PROSE: Peril in Mechanistria [+]Loading...["Peril in Mechanistria (short story)"]) It was damaged again when the Doctor and his companions departed from Corbo. (PROSE: The Playthings of Fo [+]Loading...["The Playthings of Fo (short story)"])
