The Holo-Map Projector is a device used by Star-Lord to locate the ruins of Morag. It was capable of scanning and creating holographic reconstructions of how a scanned area was like in the past.
The Broker gave Star-Lord the Holo-Map Projector to scan and recreate the surface of the now abandoned planet Morag, showing the structures and life-forms that once populated the planet.
However, his main purpose was to locate the extremely valuable item known as the Orb, with the Holo-Map Projector revealing its location inside a building. As soon as Star-Lord reached the building, he turned off the Map Device.
In the Guardians of the Galaxy animated TV series on Disney XD, the device was called the Chrono-scanner.