What is indicated by the report of 6SM visibility?

The report of 6SM visibility specifically indicates a visibility of 6 statute miles. The term "SM" stands for statute miles, which is a standard unit of measurement used in aviation to describe visibility, particularly in the context of weather conditions at airports and for flight operations. Statute miles are commonly used in the United States, and this terminology is crucial for pilots to understand precisely how far they can see, which can impact flight safety and decision-making.

This visibility report does not imply anything about the visibility being applicable only during daylight or suggest anything about it being less than 6 miles. Rather, it objectively conveys the extent to which visibility can be measured and understood in a consistent manner, which is vital for navigation and operation of aircraft.