Nautical miles per day to inches per second conversion calculator above calculates how many inches per second are in 'X' nautical miles per day (where 'X' is the number of nautical miles per day to convert to inches per second). In order to convert a value from nautical miles per day to inches per second (from nmi/d to in/s) type the number of nmi/d to be converted to in/s and then click on the 'convert' button.