Patent ID: 8836698

Claim:
A portable unit comprising: a three dimensional image of a stationary map coupled to a memory containing an object; a plane containing a first axis and a second axis in the stationary map, wherein the second axis intersects the first axis at a reference point; a third axis intersects the plane at the reference point; a screen of the portable unit displays a two-dimensional cross-sectional image of the object within the plane; the portable unit is moved from the reference point to a final point defined by a vector; an inertial guidance system configured to provide movement data to a microprocessor as the portable unit is moved; the microprocessor calculates a magnitude and a direction of the vector using software; the direction includes a first angle from the first axis and a second angle from the third axis; the magnitude comprises a distance between the reference point and the final point; the microprocessor extracts image data from the memory corresponding to the magnitude and the direction of the vector; and the screen of the portable unit displays the image data extracted from the memory; wherein the extracted image data corresponding to the magnitude and the direction of the vector is configured by the microprocessor to display a new two-dimensional cross-sectional image of the object.