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<blockquote data-quote="Topgun 30-06" data-source="post: 757658" data-attributes="member: 28854"><p><strong>Somewhere in most GPS setups there will be a function to either turn WAAS on or off on the unit. Anyway, here is the explanation to get better accuracy out of almost any GPS.</strong></p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p><strong>Wide Area Augmentation System</strong></p><p> </p><p>From Wikipedia, the free encyclopedia</p><p> </p><p>Jump to: <a href="http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#mw-head" target="_blank">navigation</a>, <a href="http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#p-search" target="_blank">search</a></p><p>"WAAS" redirects here. For other uses of the acronym "WAAS", see <a href="http://en.wikipedia.org/wiki/WAAS_(disambiguation)" target="_blank">WAAS (disambiguation)</a>.</p><p><a href="http://en.wikipedia.org/wiki/File:WAAS-Logo.gif" target="_blank"><img src="http://upload.wikimedia.org/wikipedia/commons/6/68/WAAS-Logo.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><a href="http://en.wikipedia.org/wiki/File:WAAS-Logo.gif" target="_blank"><img src="http://bits.wikimedia.org/static-1.21wmf8/skins/common/images/magnify-clip.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>FAA WAAS logo</p><p> </p><p> </p><p> </p><p><a href="http://en.wikipedia.org/wiki/File:FAA_WAAS_System_Overview.jpg" target="_blank"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/0/09/FAA_WAAS_System_Overview.jpg/220px-FAA_WAAS_System_Overview.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><a href="http://en.wikipedia.org/wiki/File:FAA_WAAS_System_Overview.jpg" target="_blank"><img src="http://bits.wikimedia.org/static-1.21wmf8/skins/common/images/magnify-clip.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>WAAS system overview</p><p> </p><p> </p><p> </p><p>The <strong>Wide Area Augmentation System</strong> (<strong>WAAS</strong>) is an <a href="http://en.wikipedia.org/wiki/Air_navigation" target="_blank">air navigation</a> aid developed by the <a href="http://en.wikipedia.org/wiki/Federal_Aviation_Administration" target="_blank">Federal Aviation Administration</a> to augment the <a href="http://en.wikipedia.org/wiki/Global_Positioning_System" target="_blank">Global Positioning System</a> (GPS), with the goal of improving its accuracy, integrity, and availability. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including <a href="http://en.wikipedia.org/wiki/Precision_approach" target="_blank">precision approaches</a> to any airport within its coverage area.<a href="http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#cite_note-FAA_WAAS_FAQ-1" target="_blank">[1]</a></p><p>WAAS uses a network of ground-based reference stations, in <a href="http://en.wikipedia.org/wiki/North_America" target="_blank">North America</a> and <a href="http://en.wikipedia.org/wiki/Hawaii" target="_blank">Hawaii</a>, to measure small variations in the GPS satellites' signals in the <a href="http://en.wikipedia.org/wiki/Western_hemisphere" target="_blank">western hemisphere</a>. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.</p><p>The <a href="http://en.wikipedia.org/wiki/International_Civil_Aviation_Organization" target="_blank">International Civil Aviation Organization</a> (ICAO) calls this type of system a <a href="http://en.wikipedia.org/wiki/GNSS_augmentation" target="_blank">satellite-based augmentation system</a> (SBAS). Europe and Asia are developing their own SBASs, the Indian <a href="http://en.wikipedia.org/wiki/GPS_Aided_Geo_Augmented_Navigation" target="_blank">GPS Aided Geo Augmented Navigation</a> (GAGAN), the <a href="http://en.wikipedia.org/wiki/European_Geostationary_Navigation_Overlay_Service" target="_blank">European Geostationary Navigation Overlay Service</a> (EGNOS) and the Japanese <a href="http://en.wikipedia.org/wiki/Multi-functional_Satellite_Augmentation_System" target="_blank">Multi-functional Satellite Augmentation System</a> (MSAS), respectively. Commercial systems include <a href="http://en.wikipedia.org/wiki/StarFire_(navigation_system)" target="_blank">StarFire</a> and <a href="http://en.wikipedia.org/wiki/OmniSTAR" target="_blank">OmniSTAR</a>.</p></blockquote><p></p>
[QUOTE="Topgun 30-06, post: 757658, member: 28854"] [B]Somewhere in most GPS setups there will be a function to either turn WAAS on or off on the unit. Anyway, here is the explanation to get better accuracy out of almost any GPS.[/B] [B]Wide Area Augmentation System[/B] From Wikipedia, the free encyclopedia Jump to: [URL="http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#mw-head"]navigation[/URL], [URL="http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#p-search"]search[/URL] "WAAS" redirects here. For other uses of the acronym "WAAS", see [URL="http://en.wikipedia.org/wiki/WAAS_(disambiguation)"]WAAS (disambiguation)[/URL]. [URL="http://en.wikipedia.org/wiki/File:WAAS-Logo.gif"][IMG]http://upload.wikimedia.org/wikipedia/commons/6/68/WAAS-Logo.gif[/IMG][/URL][URL="http://en.wikipedia.org/wiki/File:WAAS-Logo.gif"][IMG]http://bits.wikimedia.org/static-1.21wmf8/skins/common/images/magnify-clip.png[/IMG][/URL] FAA WAAS logo [URL="http://en.wikipedia.org/wiki/File:FAA_WAAS_System_Overview.jpg"][IMG]http://upload.wikimedia.org/wikipedia/commons/thumb/0/09/FAA_WAAS_System_Overview.jpg/220px-FAA_WAAS_System_Overview.jpg[/IMG][/URL][URL="http://en.wikipedia.org/wiki/File:FAA_WAAS_System_Overview.jpg"][IMG]http://bits.wikimedia.org/static-1.21wmf8/skins/common/images/magnify-clip.png[/IMG][/URL] WAAS system overview The [B]Wide Area Augmentation System[/B] ([B]WAAS[/B]) is an [URL="http://en.wikipedia.org/wiki/Air_navigation"]air navigation[/URL] aid developed by the [URL="http://en.wikipedia.org/wiki/Federal_Aviation_Administration"]Federal Aviation Administration[/URL] to augment the [URL="http://en.wikipedia.org/wiki/Global_Positioning_System"]Global Positioning System[/URL] (GPS), with the goal of improving its accuracy, integrity, and availability. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including [URL="http://en.wikipedia.org/wiki/Precision_approach"]precision approaches[/URL] to any airport within its coverage area.[URL="http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#cite_note-FAA_WAAS_FAQ-1"][1][/URL] WAAS uses a network of ground-based reference stations, in [URL="http://en.wikipedia.org/wiki/North_America"]North America[/URL] and [URL="http://en.wikipedia.org/wiki/Hawaii"]Hawaii[/URL], to measure small variations in the GPS satellites' signals in the [URL="http://en.wikipedia.org/wiki/Western_hemisphere"]western hemisphere[/URL]. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy. The [URL="http://en.wikipedia.org/wiki/International_Civil_Aviation_Organization"]International Civil Aviation Organization[/URL] (ICAO) calls this type of system a [URL="http://en.wikipedia.org/wiki/GNSS_augmentation"]satellite-based augmentation system[/URL] (SBAS). Europe and Asia are developing their own SBASs, the Indian [URL="http://en.wikipedia.org/wiki/GPS_Aided_Geo_Augmented_Navigation"]GPS Aided Geo Augmented Navigation[/URL] (GAGAN), the [URL="http://en.wikipedia.org/wiki/European_Geostationary_Navigation_Overlay_Service"]European Geostationary Navigation Overlay Service[/URL] (EGNOS) and the Japanese [URL="http://en.wikipedia.org/wiki/Multi-functional_Satellite_Augmentation_System"]Multi-functional Satellite Augmentation System[/URL] (MSAS), respectively. Commercial systems include [URL="http://en.wikipedia.org/wiki/StarFire_(navigation_system)"]StarFire[/URL] and [URL="http://en.wikipedia.org/wiki/OmniSTAR"]OmniSTAR[/URL]. [/QUOTE]
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