  This paper presents a comprehensive review of the current state of the art in
quantum navigation systems, with a specific focus on their application in
maritime navigation. Quantum technologies have the potential to revolutionise
navigation and positioning systems due to their ability to provide highly
accurate and secure information. The review covers the principles of quantum
navigation and highlights the latest developments in quantum-enhanced sensors,
atomic clocks, and quantum communication protocols. The paper also discusses
the challenges and opportunities of using quantum technologies in maritime
navigation, including the effects that the maritime environment and the
specificity of marine applications can have on the performance of quantum
sensors. Finally, the paper concludes with a discussion on the future of
quantum navigation systems and their potential impact on the maritime industry.
This review aims at providing a valuable resource for researchers and engineers
interested in the development and deployment of quantum navigation systems.
