What does the 6 minute rule calculate?

The 6-minute rule is a navigational tool used to quickly calculate the distance traveled over a specific time period based on speed. Specifically, it states that if a vessel is traveling at a speed of one knot, it covers one nautical mile in one hour. Therefore, in 6 minutes (which is one-tenth of an hour), that vessel will cover one-tenth of a nautical mile, which is 1/10 of a nautical mile or approximately 600 feet.

To determine the distance traveled in that same 6-minute timeframe at any given speed in knots, the calculation is straightforward: distance equals speed multiplied by time. This rule allows for quick estimations while at sea, enabling mariners to gauge their progress and make necessary navigational adjustments.

While the other options reference various distance concepts, they do not align with the specific application of the 6-minute rule, which is focused on using speed in knots to determine distance in nautical miles for the 6-minute interval.