Geosoft grid files for Camp Stanley detail area flown with 50m flight lines grid cell size is 10m Projection NAD27 UTM14N meters DIRECTORY ESRI contains same files in ESRI binary grid format RES* grids are apparent resistivity in ohm meters at the indicated frequency TMI is the total magnetic field with IGRF removed RES115K_B3.GRD RES1500_B3.GRD RES25K_B3.GRD RES400_B3.GRD RES6200_B3.GRD TMI_B3.GRD