What type of approaches utilize WAAS for course guidance?

RNAV (Area Navigation) approaches utilize WAAS (Wide Area Augmentation System) for course guidance because WAAS enhances the accuracy, integrity, and availability of GPS signals. This allows RNAV systems to provide precise lateral and vertical guidance, making approaches safer and more reliable. While other options like ILS and VOR are traditional navigation aids, they do not rely on WAAS; instead, they operate independently of GPS and its augmentations. GPS approaches also benefit from WAAS, but it's specifically the RNAV approaches that incorporate WAAS data for advanced navigation procedures, allowing pilots to fly more direct routes and improving overall air traffic efficiency.