The Pathfinder Project, also referred to as Project Voyager, was the title of a Starfleet Communications project that attempted to communicate with USS Voyager, which was stranded in the Delta Quadrant.
It was created sometime between 2374 and 2376, following the discovery of Voyager's presence in the Delta Quadrant when The Doctor was sent to the USS Prometheus. It was overseen by Admiral Owen Paris, and was based at Starfleet's Communications Research Center. The day-to-day running of the project was handled by Commander Peter Harkins, and its staff included Lieutenant Reginald Barclay. Deep Space 9 also assisted the project by providing interstellar phenomena forecasts.
It first made contact with Voyager in 2376, using the MIDAS array to create a micro-wormhole. Although the first communication was brief and problematic – merely allowing Admiral Paris to talk to Captain Kathryn Janeway, who assured him that his son was performing well – the communications technology improved to a level whereby contact could be made on a regular basis. In 2377, the crew was able to receive monthly data streams from Earth that included letters from the crew's families, tactical upgrades, and news about the Alpha Quadrant. By 2378, two-way visual communication was possible every day for eleven minutes. (VOY: "Pathfinder", "Life Line", "Inside Man", "Author, Author", "Endgame")
The project may have been terminated after the successful return of Voyager to the Alpha Quadrant, or possibly extended to serve as a method to communicate with other ships at far ranging distances.
In the DS9 Mission Gamma novel Lesser Evil, the crew of the USS Defiant consult the Pathfinder Project's database for Voyager's information on the Borg after discovering a Borg presence in the Gamma Quadrant.