Certified Flight Instructor – Instrument (CFII) Knowledge Practice Test

The correct answer is 6,000 feet, as one nautical mile is defined as exactly 1,852 meters, which converts to approximately 6,076.1 feet. However, in aviation and nautical contexts, it’s common to round this value down to about 6,000 feet for practical purposes, which makes it the most widely accepted approximate figure used in flight operations.

In aviation, the nautical mile is crucial because it directly relates to the circumference of the Earth and is used for navigation and charting. The value of 5,280 feet represents a statute mile, which is not directly applicable in maritime and aviation navigation where nautical miles are commonly used. The other figures (7,200 feet and 6,500 feet) are not standard measurements for nautical miles, reinforcing that they do not apply within the context of flight instruction. Understanding the significance of the nautical mile and its relation to the Earth’s geometry helps in calculations involving distance over the globe.