forget:
One minute of arc, from the centre of the earth, is 6,080 of today's feet, or 72,960 inches. 72,960 divided by 18.24 = 4,000. So a minute of arc is the clumsy number of 6,080 feet, or exactly 4,000 Cubits'.
Nonetheless, that horse lost the race.
There are still self-professed experts who proclaim 6,080 feet is one nautical mile. But, the horse have long since departed the barn, the barn subsequently burned down, and the land on which the barn stood has been sold at a bankruptcy action.
The precise definition of the n.m. is critically important when working in small RNP values.