The invention comprises an integrated skin-mountable multifunction device for use with a computer assisted or image guided surgical system and methods of using the same, wherein the multifunction device includes a patient mountable portion that has at least one position indicating element and at least one imageable pattern whose geometry is known in a coordinate system of the at least one position indicating element, wherein the imageable pattern is visible on an imaging modality. The multifunction device may also include a monitoring device capable of measuring a physiological parameter of a patient for use in gating image or position signals or for other purposes.