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relieve frequency congestion by automating the repetitive <br />transmission of essential but routine information. <br />Automatic Directional Finder JADE) - An aircraft radio navigation <br />system that senses and indicates the direction to an L/MF <br />nondirectional radio beacon (NDB) ground transmitter. <br />Distance Measuring Eauinment (DMEI - Equipment (airborne and <br />ground) used to measure, in nautical miles, the slant range distance <br />of an aircraft from the DME navigational aid (see VORTAC or <br />Microwave Landing System). <br />VHF Omnidirectional Range/Tactical Air Navigation f VORTACI - A <br />navigational aid providing VOR azimuth, TACAN azimuth, and <br />TACAN distance measuring equipment (DME) at one site. <br />Very High Frequency Omnidirectional Ranee Station (VOR) - A <br />ground -based electronic navigational aid transmitting very high <br />frequency navigation signals, 360 degrees in azimuth, oriented from <br />magnetic north, periodically identifying itself by Morse Code. <br />Wind Sock - Cloth sleeve, mounted aloft at an airport and used to <br />estimate wind direction and velocity. I/ <br />Wind Tee - Indicator of wind direction for takeoff and landings. 1/ <br />After initial inventory investigation, a major difference in offered <br />NAVAID facilities was noted between MSP and the other system airports. <br />Because part of the reliever study focuses on the potential to draw general <br />aviation traffic away from MSP, it is important to examine NAVAID facilities <br />at MSP. The following are a list of additional navigational facilities found at <br />MSP: <br />Low Level Wind -Shear Alert System (LLW-SAS) - A system to alert <br />pilots of wind shears, a change in wind speed and/or wind direction <br />m a short distance, critical during landing. <br />• Runway Visual Range (RVR) - An instrumentally derived value, based <br />on standard calibration, that represents the horizontal distance a <br />pilot will see down the runway from its approach end. <br />• Simplified Short Approach Lighting System (SSALR) - High intensity <br />lighting system with runway alignment indicator lights. <br />1/ Aviation Fundamentals, 6th Edition, 1981. <br />I-22 <br />