Abstract: A non-destructive inspection system makes use of a template that is put on a structure to be inspected to provide an image-based display of inspection results. The template, an example of which is a grid, defines locations on the structure from which inspection data are obtained. A portable display device, an example of which is a laptop computer, with information about the template receives information pertaining to inspection data obtained from locations defined by the template and displays inspection results in an image-based format that corresponds to the template. An example of such a system uses “tap test” non-destructive inspection techniques and provides an image-based display of a plurality of structural stiffness measures, each stiffness measure calculated from a measure of impact duration for a “tap”.