Stellar Cartography. One of the DeLanney sisters worked there in season 1.
If Voyager had a Science Officer, which it didn't, I would have put Stellar Cartography under The Science (Applied Sciences?) Department's remit and letterhead...
Although Janeway had no respect for Stellar Cartography.
From Deathwish, talking about Quinn.
JANEWAY: We could shut down Stellar Cartography with all the knowledge he'd bring to the job.
Then along came Astrometrics.
All those poor Stellar Cartographers put out of work so that the Astrometricians have something to do.