This website will let you check one set of coordinates against many others. The idea is to let you 'trial and error' until you find a coordinate that is .1 away from all others.
You MUST input your LAT/LON like this: N45 12.123 W093 45.678 becomes:
N/S/W/E are irrelevant for this
THIS ASSUMES DD:MM.MMM FORMAT! NO OTHER FORMATS WILL GIVE YOU ACCURATE RESULTS.
LAT/LON 1 will be compared against LAT/LON 2-9