Note: UTM referencing is only used for plotting purposes. MARE2DEM completely ignores this for the 2D EM calculations.
To help with post-inversion plotting of well logs and SEG-Y seismic overlays on your 2D inversion models, the data file has a line for specifying the UTM zone, origin and rotation of the 2D model coordinates:
The 2D strike angle is the geographic angle corresponding to the x direction of the 2D model, clockwise from north. The example below has a 2D strike of 20º.