The TGS Navigation System uses augmented reality technology for functional endoscopic sinus surgery (FESS) procedures and merges the pre-operative plan with the endoscopic image to offer real-time anatomical guidance directly on the surgical monitor. It offers standard-of-care EM technology combined with groundbreaking Scopis augmented reality to provide real time navigation with a special instrument guidance and notification system guiding endoscopic instruments on pathways directly to the targets.