There are three patterns generated by BullseyeBore: a single dynamic position pattern, and two fixed circular measurement patterns. This is demonstrated in the video (left) and images (below) with the single dynamic position pattern as the outermost pattern, and the fixed circular measurement patterns on the inside.

The single dynamic position pattern changes shape dramatically when the drill is misaligned with the work surface, while the two fixed measurement patterns maintain consistent and evenly spaced concentric circles regardless of alignment.

A drill is properly aligned with the work surface when the single position pattern becomes circular and is concentric with the two fixed measurement patterns.

The images below provide examples of proper alignment, minor misalignment and major misalignment.