Definition
A unit of linear distance equal to 5,280 feet (approximately 1,609 meters). In U.S. aviation, statute miles are used to express visibility values in weather reports, takeoff and landing minimums, and on sectional charts, while distances flown are typically measured in nautical miles.
Plain English
The standard land mile used on roads in the United States. It is shorter than a nautical mile. In aviation, you mostly see it when visibility is being reported.
Context Anchor
Seen in takeoff minimums, weather reports, and visibility requirements for instrument procedures.
Derivation
From the Latin 'statutum,' meaning something fixed by law. The statute mile was set by English law (originally a 1593 statute) at 5,280 feet to standardize land measurement. The name simply means 'the legally fixed mile,' which is why it is distinct from the nautical mile used for navigation at sea and in the air.
Why Pilots Care
Takeoff and landing visibility minimums are frequently published in statute miles, so pilots must use the correct unit when checking weather and minimums.
Intuition Check
Do not assume every aviation mile is a nautical mile. For visibility in FAA procedures and weather reports, “statute mile” means the standard 5,280-foot land mile.
Example Sentence 1
The takeoff minimums for that runway require at least one statute mile of visibility.
Example Sentence 2
Prevailing visibility on the METAR is reported in statute miles.