The USS Ganymede (NCC-18451) was a Federation starship that was in service with Starfleet in the mid-24th century. In 2364, Darryl Oja was captain of the ship.
That same year, prior to stardate 41775, this starship, along with the USS Puget Sound, were jointly surveying Sector 450. Both starship captains received orders from a Starfleet admiral at the Starfleet Mission Operations Division.
In these orders, the captains were ordered to avoid Subsectors 4534 to 4432 and to refrain from using high energy sensor scans in another Subsector 4418. That order had been supported by Admiral Marcia Meldal-Johnsan and dealt with diplomatic negotiations with the New Zealand government. Both captains were to acknowledge this order on subspace com net security code 045, code 100 alpha.
At the end of 2364, Data read this order and several others to investigate claims of a conspiracy among the highest members of Starfleet Command. (TNG: "Conspiracy")