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1“...1. INTRODUCTION. Very-low-frequency radio waves were used to implement the Omega navigation system...”
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2“...Precise navigation upon the ice-cap depends largely upon the accurate steering of a chosen course...”
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4by Gudmundsson, Gudmundur A., Alerstam, Thomas, Larsson, Bertil“... marine navigation radar. The terns migrated north at altitudes 30–60 m asl along the inner coast...”
Published in Antarctic Science (1992)
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5“... ships navigating those hazardous waters in the late eighteenth and early- to mid-nineteenth centuries...”
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