The Federation mission scoutship was a small one-person Starfleet craft assigned to Data during the survey of the Ba'ku, which he used against the Son'a after he was damaged.
The scoutship appears in Star Trek: Insurrection. Data is on loan to the joint Federation and Son'a team secretly observing the Ba'ku village, and the little ship is his transport. After he is shot by the Son'a for discovering the hidden holoship, his ethical programming takes over. He exposes the observers' hide to the villagers, takes the scout into orbit and fires on any ship that approaches.
Picard and Worf go after him in a shuttle from the Enterprise-E. The chase runs down through the atmosphere, and ends when they dock with the scout and shut the android down.
The craft is a narrow single-seat design with the cockpit at the front, armed and capable of warp.