Gravitic drift compensator
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This topic might have a better name.
"Gravitic drift compensator". Nothing to suggest the capitals.
Talk about it here.
The gravitic drift compensator was a component of the Doctor's TARDIS. The Fourth Doctor admitted that he did not know what a gravitic drift was, but told Leela that it was useful to take precautions so that one does not get stuck in one. (AUDIO: The Renaissance Man)