In aviation navigation, NM refers to which unit?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

In aviation navigation, NM refers to which unit?

Explanation:
In aviation navigation, NM stands for nautical mile. Distances on charts, flight plans, and airways are expressed in nautical miles because one nautical mile is tied to the Earth’s geometry: it is defined as one minute of latitude along a meridian, so 1 NM equals 1/60 of a degree of latitude. This makes distance measurements consistent worldwide as you move across the globe. The nautical mile is defined as 1,852 meters (about 1.15078 statute miles), which is why it’s the standard unit for navigation. Kilometers or meters aren’t aligned with the latitude/longitude grid used on charts, and inches are unrelated to aviation navigation.

In aviation navigation, NM stands for nautical mile. Distances on charts, flight plans, and airways are expressed in nautical miles because one nautical mile is tied to the Earth’s geometry: it is defined as one minute of latitude along a meridian, so 1 NM equals 1/60 of a degree of latitude. This makes distance measurements consistent worldwide as you move across the globe. The nautical mile is defined as 1,852 meters (about 1.15078 statute miles), which is why it’s the standard unit for navigation. Kilometers or meters aren’t aligned with the latitude/longitude grid used on charts, and inches are unrelated to aviation navigation.

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