The length unit of the sea is a newly launched popular content in the game. Many players and users have some problems with the game's different strategies to pass the level. Below, the editor of Source Code Network will introduce the units of length at sea.
Question: A little navigation knowledge, which of the following is a unit of length at sea?
Answer: nautical miles .
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Unlike the unit of length on land, the unit of length for surveying and mapping at sea is the nautical mile.
A nautical mile refers to the arc length corresponding to one minute of meridian latitude, and because the earth is not a perfect circle.
Therefore, the length of the sea mile varies in each region, with the length of the sea mile at the equator being the shortest.