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GLOSSARY <br />APPENDIX A <br />UNICOM (Aeronautical Advisory Station) <br />: A nongovernment air/ground radio communication facility <br />which may provide airport information at certain airports. (AIM) <br />VERY-HIGH-FREQUENCY OMNIDIRECTIONAL RANGE (VOR) <br />: The standard navigational aid used <br />throughout the airway system to provide bearing information to aircraft. When combined with Distance <br />Measuring Equipment (DME) or Tactical Air Navigation (TACAN) the facility, called VOR-DME or <br />VORTAC, provides distance as well as bearing information. <br />VISUAL APPROACH SLOPE INDICATOR (VASI) <br />: An airport landing aid which provides a pilot with <br />visual descent (approach slope) guidance while on approach to landing. Also see PAPI. <br />VISUAL FLIGHT RULES (VFR) <br />: Rules that govern the procedures for conducting flight under visual <br />conditions. The term "VFR" is also used by pilots and controllers to indicate type of flight plan. (AIM) <br />VISUAL GLIDE SLOPE INDICATOR (VGSI): <br /> A generic term for the group of airport visual landing aids <br />which includes Visual Approach Slope Indicators (VASI), Precision Approach Path Indicators (PAPI), and <br />Pulsed Light Approach Slope Indicators (PLASI). When FAA funding pays for this equipment, whichever <br />type receives the lowest bid price will be installed unless the airport owner wishes to pay the difference <br />for a more expensive unit. <br />VISUAL RUNWAY <br />: A runway intended solely for the operation of aircraft using visual approach <br />procedures, with no straight-in instrument approach procedure and no instrument designation indicated <br />on an FAA-approved airport layout plan. (Airport Design) <br />WARNING AREA <br />: A type of special use airspace which may contain hazards to nonparticipating aircraft <br />in international airspace. (AIM) <br />A-10 <br />Eugene Airport Master Plan Update <br />(February 2010) <br /> <br />