Speed of light to nautical miles per hour converter above calculates how many nautical miles per hour are in 'X' speed of light (where 'X' is the number of speed of light to convert to nautical miles per hour). In order to convert a value from speed of light to nautical miles per hour (from c to nmi/h) type the number of c to be converted to nmi/h and then click on the 'convert' button.