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AIRPORT MASTER PLAN <br />takeoffs) will be conducted annually under IFR flight rules by the end of the 20-year <br />planning period. The following describes the status of existing and new NAVAIDs <br />used at general aviation airports. <br />Very High Frequency Omni-Directional Radio Range <br />The Very High Frequency Omni-Directional Radio Range (VOR/VORTAC) system <br />emits a very high frequency radio signal utilized for both enroute navigation and <br />non-precision approaches. It provides an instrument rated pilot with 360 degrees of <br />azimuth information oriented to magnetic north. Due to the recent development of <br />more precise navigational systems it is planned to be phased-out by the FAA. <br />The San Marcos Regional Airport is served by the Randolph VORTAC, located 31.4 <br />nautical miles southeast of the Airport, and the Centex VORTAC, located 33.9 <br />nautical miles north of the Airport. The Centex VOR is utilized for the Runway 13 ILS <br />approach to identify the outer marker. ased <br />approaches and enroute navigation, it is not expected that any additional VORs will <br />be needed in the area. <br />Global Positioning System <br />The Global Positioning System (GPS) is a highly accurate worldwide satellite <br />navigational system that is unaffected by weather and provides point-to-point <br />navigation by encoding transmissions from multiple satellites and ground-based <br />data-link stations using an airborne receiver. GPS is presently FAA-certified for <br />enroute and instrument approaches into numerous airports. The current program <br />provides for GPS stand-alone and overlay approaches where GPS fixes are overlaid <br />on top of an existing approaches (typically NDB or VOR approaches). <br />The Wide Area Augmentation System (WAAS) is being installed at or near airports to <br />provide a signal correction enabling GPS precision approaches (commonly called <br />GPS approaches with LPV minimums). As discussed earlier in this chapter, Runway <br />17 should be evaluated for a GPS approach with ¾ mile visibility minimums. <br />Non-Directional Beacons (NDBs) <br />NDBs are an older ground based navigational technology that are still used in some <br />places to provide redundant navigational capabilities at airports. NDBs emit a signal <br />Facility Requirements Chapter Page 51 of 70 <br />October 2020 <br /> <br />