Maths, the subject of mass boredom at school. However, you will need to go back to your school days to solve this one.
Brains and a calculator will be very helpful in solving this one.
(If all else fails Google will be a valuable resource)
Assume N50 43.AEC W004 00.DBF
Solve these Equations:
4A-15 = 17
√(4D)=2
5B-2D=43
4C+4=3C+13
E=04
F=6170
Checksum A+B+C+D+E+F=28
You can check your answers for this puzzle on GeoChecker.com.