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The first compass was made in China during 206 BCE
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The first map on Earth was created on 200 BCE
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The modern-day compass was created in the year 700 and magnetic needles replaced the old compass. Was believed to be made by the Chinese.
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The first Radio was created in Italy.
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The echo sounder was invented by Alexander Behm. Echo sounding is a device to determine depth and distance by soundwaves.
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The GPS was created when 22 satellites were built specifically for the purpose of sending position and coordinate data to ships at sea