thumbnail image 114 in other words the reticle 112 represents the current field of view that is shown as image 108 and can be dynamically updated in several different ways for example a user has the ability to increase and decrease levels of native or optical magnification accordingly the software generates the magnification level of the thumbnail image 114 to trail the current field of view image 108 by a magnification ratio or factor allowing for a consistent ratio of hand movements of the mouse 106 for example to screen navigation across different magnification levels the software further tunes this ratio by increasing or decreasing the sensitivity of the mouse 106 across magnification levels if the thumbnail image 114 does not represent the entire image movement of the reticle 112 to the periphery of the thumbnail image 114 will enable both the thumbnail image 114 and the field of view image 108 to be dynamically updated with the adjacent areas of the thumbnail image 114 that come into view as discussed below that is the software will in a sense scroll the thumbnail image 114 in the direction in which the reticle 112 is being moved once the reticle 112 reaches an edge of the current thumbnail image 114 being displayed specifically in one example the software according to an embodiment of the.