information of fluxgate mag data

[N1H1]

fluxgate data over a possible site that is of the spanish mission has me puzzled..stones laid out in a symetric row .any information on "double xing" would be great. also the importance of grid layout on the magnetic northern pole as a first run. what is the best grid lay-out for proper fluxgate magnetometer scan?

 

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[N1H1]

the cat thinks i am stupid