Nautilus is a European company focused on advanced spacecraft navigation, covering the full spectrum from GNSS-based orbit determination to high-precision navigation for deep- space missions. Operating from Milan and Forlì, Nautilus supports the full mission lifecycle—from early design to in-orbit operations—through an integrated ecosystem of ground and on-board solutions. On the ground, the company develops systems that streamline mission operations, automate navigation and orbit control, and ensure high- precision flight dynamics across all mission phases, from LEO to deep space. Building on this heritage, Nautilus is also advancing on-board navigation technologies, leveraging autonomous radiometric and optical navigation, as well as inter-satellite links, to enhance mission performance and operational efficiency directly on spacecraft. These capabilities are complemented by advanced platforms for high-fidelity ground testing, enabling teams to validate autonomous navigation, guidance, and ADCS systems performance under realistic in-orbit conditions before launch.