I sincerely hope that it takes no more than a fraction of a second to discard "nm" as "nanometers" and conclude that it means nautical miles, or at least some u

I sincerely hope that it takes no more than a fraction of a second to discard "nm" as "nanometers" and conclude that it means nautical miles, or at least some unknown term (if you are unfamiliar with customary aviation units).