Aircraft navigation and safety in the absence of GPS/Galileo signals can be improved by higher performances Inertial Measurement Units (IMU) and thus by higher performances gyroscopes.The “Atomic Gyroscope for Enhanced Navigation (AGEN)” project aims at showing the feasibility of the development of such an inertial grade gyroscope for aircraft navigation and delivering higher performances than Ring Laser Gyroscopes while having small dimensions and power consumption. Atom (atomic) gyroscopes hold the promise of reaching even better performances, but their state of development is presently in the “research” stage and user’s requirements in terms of size, power consumption, cost and performances will be analyzed and targeted.Such a development may open up new application fields such as unmanned commercial flight, enhanced navigation for UAVs, enhanced marine, sub-marine and Unmanned Surface Vehicle navigation.A conceptual design will be performed, allowing the trade-off between various concepts. Laboratory tests will be restrained to validating the gas cell, the heart of an atomic gyroscope, showing the feasibility of such a concept.This development will bring redundancy and will enhance the robustness of guiding systems relying on Galileo..Finally, an assessment and a roadmap of the future development steps will be performed.