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Not all icebergs are large enough to be tracked by official monitoring agencies. Historically, the USNIC tracked icebergs in the Southern Hemisphere using a minimum size criterion of 10 nautical miles on the longest axis. Due to improved satellite imagery resolution and availability, they are expanding these criteria to include icebergs of 20 square nautical miles or greater. Smaller icebergs may not appear in official tracking databases.
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