JP you need to pick an area you are going to hunt and set for that area! I agree NOAA has different readings. I guess the science they are using is flawed! As I said I always check my mag and adjust accordingly.
For those who want to test will need a generator that has .1hz increments and sine wave. They will have to make a coil also. Using a spool of speaker wire 16ga. 100ft attach one end to the generator output and the other end split to about 2 ft and solder to brass rods to insert into the ground.
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Bringing metal detectors into the world of imaging!
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