Star Trek Expanded Universe

The holotank on the USS Enterprise-D.

Holotanks were special laboratories on Federation starships primarily used by stellar cartography departments. The labs made use of extensive holography to display areas of space.

In 2371, Captain Jean-Luc Picard and Lieutenant Commander Data used the holotank on the USS Enterprise-D to track the course of the Nexus. (Star Trek Generations)

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