Get the map from the NCR Rangers, for Vortis the slaver

Get the map from the NCR Rangers, for Vortis the slaver is a quest in Fallout 2.

Background
As the NCR Rangers are a threat to slaver operations in Northern California, they would do anything to hamper their operations. The slaver Vortis from NCR looks to procure the Ranger Map from their headquarters in the downtown NCR area and the Chosen One can provide him with it, for adequate compensation - 500$.