Hi this may be a dumb question however her goes. When putting in coordinates into my Sat Nav you have to put in Eg N 50°55 9684' E 001 etc etc. However frequently in various Site books Eg Aires of France they only give you 3 digits at the end Eg N 50°55 968. My question is how do you know what 4th number to put in. You cannot miss it out and if you put a random number in the Sat Nav will not take you to the correct location Any advice would be welcome