Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
An octopus has how many hearts?
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The "Ring of Fire" is a string of volcanoes in and around what ocean?
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What name refers to trips across the Atlantic Ocean?
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Iceland is located in what ocean?
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In the Atlantic, hurricane season starts June 1, while in the Pacific it starts when?
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Which ocean lies between North America and Europe?
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What is the up and down movement of ocean water caused by wind called?
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Which of the following whales is scientifically classified as the "Eschrichltius Robustus"?
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