<story><title>Farmers ‘crippled’ by satellite failure as GPS-guided tractors grind to a halt</title><url>https://www.smh.com.au/national/farmers-crippled-by-satellite-failure-as-gps-guided-tractors-grind-to-a-halt-20230418-p5d1de.html</url></story><parent_chain></parent_chain><comment><author>blantonl</author><text>Note that this isn&amp;#x27;t a GPS failure, it&amp;#x27;s a failure with Inmarsat&amp;#x27;s Satellite-based Augmentation Systems (SBAS), which supplements GPS data with signal measurement errors corrections.  This allows for centimeter level positioning.</text></comment>
<story><title>Farmers ‘crippled’ by satellite failure as GPS-guided tractors grind to a halt</title><url>https://www.smh.com.au/national/farmers-crippled-by-satellite-failure-as-gps-guided-tractors-grind-to-a-halt-20230418-p5d1de.html</url></story><parent_chain></parent_chain><comment><author>yardie</author><text>This is not the USDOD GPS. This is Inmarsat&amp;#x27;s DGPS service that provides ~1-2cm accuracy. Which, if you&amp;#x27;re driving between rows of produce can be the difference between harvesting or crushing crops.&lt;p&gt;[0]&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Differential_GPS&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Differential_GPS&lt;/a&gt;</text></comment>