if you go to the FNC sight you will get a picture of the mags without the colors.they show the magnetic deviation from an under ground source. the closely wraped rings of magnetizm indicate an anomely.i once took a prospecting course an we covered these maps. the maps for FNC property look very good. the closer line spacing on the current mags being flown will be very confusing because the detail will be 3 times greater so the maps will be harder to read. a geologist will be able to follow them. i have seen maps like this from hemlo and they are very confusing.