Grand Staircase topographical map

Grand Staircase Topographical Map is a quest item in the Fallout: New Vegas add-on Honest Hearts.

Characteristics
As the name suggests, it is a holotape that contains a map of the Grand Staircase, which Daniel intends to traverse over with the Sorrows.

Location
It is located in Morning Glory Cave. Behind an average locked door in the southern section of the cave, inside of a survival cache.