In accordance with certain aspects of the present invention, enhancements have been developed to further extend the performance of a generic DVD navigator. A consumer policy request for a web service is mediated through a functional web service or a policy web service. The outer casing surrounds the inner casing and has a gap included between an inner wall of the inner casing and the outer casing, wherein the inner casing and the outer casing are made of materials with different thermal conductivity coefficients. By this arrangement, the center indicator accurately reflects on the gradient indicators a grade at which a surface is being cut in an excavating process when viewed in combination with the gradient indicators due to multi-axis gravitation movement of the inner orb. One embodiment allows the user to import the image stack into an image-processing software application that produces the composite image.