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2. www.ixblue.com
3. www.safran-electronics-defense.com/naval-solutions/surface-vessels/navigation-systems
4. https://www.sbg-systems.com/products/apogee-series-high-accuracy-ins-gnss/
5. https://www.imar-navigation.de/en/products/by-application/category/defence-applications-navigation-stabilization-guidance-surveying