OCEANS AND COUNTRIES
INDIAN TRANSPORTATION COMMUNICATION NATIONAL PARKS AND SANCTUARIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The nautical mile is longer than the statute mile
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Of difference in land and sea distances
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There are no milestones in the sea
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None of the above
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Detailed explanation-1: -Originally Answered: Why distances at Seas or oceans are measured in nautical miles and not in usual miles or km ? A nautical mile is based on the circumference of the earth, and is equal to one minute of latitude. It is slightly more than a statute (land measured) mile (1 nautical mile = 1.1508 statute miles ).
Detailed explanation-2: -A nautical mile is slightly longer than a mile on land, equaling 1.1508 land-measured (or statute) miles. The nautical mile is based on the Earth’s longitude and latitude coordinates, with one nautical mile equaling one minute of latitude. But why use a different measurement system for marine navigation?
Detailed explanation-3: -This is because the Earth’s polar circumference is 21, 600 nautical miles which is 60x360 (360degrees in a circle each being 60 nautical miles long). This made calculations at sea much easier to perform, but results in a nautical mile being 1.15 standard miles long.
Detailed explanation-4: -The ‘standard’ nautical mile is taken as 6080 feet (1.151 statute miles or 1853 metres) and is the unit of length used in sea and air navigation.
Detailed explanation-5: -At sea, in navigational calculations, the statute mile is considered an arbitrary length of no particular significance. And in particular, the replacement of the ordinary measurement with nautical miles and knots at sea helps the Mariners to read charts that use latitude and longitude quickly.