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AIRPORT MASTER PLAN <br />N AVIGATIONAL A IDS (NAVAID) <br />NAVAIDs, located on the field or at other locations in the region, are specialized <br />equipment that provide pilots with electronic guidance and visual references in an <br />effort to execute instrument approaches and point-to-point navigation. This section <br />discusses the NAVAIDs currently located at or near the San Marcos Regional Airport <br />and/or that play a role in how the airport is used. <br />Precision Approach Path Indicators (PAPIs) <br />PAPIsare visual NAVAIDs that provide pilots with a visual indication of whether they <br />are following an established glide path during an approach to a runway end. Based <br />on the pilots location relative to the established glide path, the PAPI system will <br />provide the pilot with a visual indication of whether they are higher, lower, or on <br />the establish glide path. <br />The San Marcos Regional Airport has PAPI systems on the ends of Runways 13, 31 <br />and 17. PAPI systems are manufactured in a 2-box and a 4-box configuration. The <br />systems currently installed at the airport are 2-box systems. <br />The established glide path for each of the existing PAPI systems at the San Marcos <br />Regional Airport is 3 degrees. the Airport are owned by the City of San <br />Marcos and are generally in good condition. The PAPIs were installed in 2015. <br />Runway End Identifier Lights (REILs) <br />REILs are visual NAVAIDs that provide pilots with a visual indication of where a <br />runway end is located. REILs are typically installed in areas where light pollution <br />could potentially cause a pilot difficulty in identifying the threshold of a runway. <br />The San Marcos Regional Airport has REIL systems on the ends of Runways 8 and <br />26. The REILs are not operational. This will be a consideration in the establishment <br />of the future development plan for the airport. <br />Inventory Chapter Page 19 of 52 <br />October 2020 <br /> <br />