Ancient manuscripts record Viking navigators relied on 'sunstones' to find their way - archaeologists believe these may have been polarising crystals to pinpoint the Sun even in overcast skies.
By contrast, Belgian frigate Leopold I-F930, participating in the end-of-year trials, carried the most up-to-date equipment possible, with multiple Galileo receivers for both its public Open Service (OS) and secure Public Regulated Service (PRS).
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