Benny's Question of the day:
Dad, what do you mean by nautical mile?
Answer: The exact length of a nautical mile has varied with our ability to measure the earth. It is the equivalent of one sixtieth of one degree, which is in itself one three-hundred-and-sixtieth of the distance around the earth. For all practical purposes, one degree of latitude equals 60 nautical miles. And therefore one minute of latitude equals one nautical mile. For many years the nautical mile was reckoned to be 6,080 feet, but now it’s officially 6,076.1 feet or 2,025.4 yards. For small-boat navigation, you can presume the nautical mile to be 2,000 yards. Unless you’re on fresh water, of course. There the mile is still the landlubber measure of 1,760 yards.
School on Wandering Dolphin