Unmanned Aerial Vehicles (UAVs), or as they are becoming known Unmanned Aircraft/Aerial Systems (UAS), are in the news now almost every day. As UAV/UAS applications become more and more sophisticated, and operators seek to integrate them into commercial undertakings, the prospect of civil certification and unrestricted access to U.S. airspace is becoming a near-term possibility. This article discusses current UAV/UAS GNSS navigation capabilities and how this could change in the future.