<story><title>GPSJam: Daily maps of possible GPS interference</title><url>https://gpsjam.org/?lat=45.00000&amp;lon=35.00000&amp;z=3.0&amp;date=2023-10-10</url></story><parent_chain></parent_chain><comment><author>jjwiseman</author><text>Hello, HN. I made this site. Link to previous discussion: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=32245346&quot;&gt;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=32245346&lt;/a&gt;&lt;p&gt;I&amp;#x27;m curious about HN&amp;#x27;s take on a couple things:&lt;p&gt;1. Why haven&amp;#x27;t FlightRadar24, FlightAware, or any of the other flight trackers done this? Not enough people actually interested? I know there are companies that use GPSJAM to help brief their pilots.&lt;p&gt;2. Monetization! I can&amp;#x27;t really justify spending more time to work on projects like this one when they don&amp;#x27;t make money, and do cost (a little) money. But I absolutely do not want to turn these projects into another another job--I don&amp;#x27;t want contracts, obligations, deadlines. Do I try to get (very niche, but I bet they exist) advertisers to cover site costs and some of my time? Do I crowdfund for general development? Let me know your thoughts. And this isn&amp;#x27;t just for GPSJAM; I have other projects. For example...&lt;p&gt;A couple other aviation related projects I&amp;#x27;ve done recently:&lt;p&gt;1. The Global Aircraft Event Viewer: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;aircraft.social&amp;#x2F;events&amp;#x2F;&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;aircraft.social&amp;#x2F;events&amp;#x2F;&lt;/a&gt; A near real-time map of higher level aircraft behaviors around planet Earth: Circling, &amp;quot;near misses&amp;quot; (RAs), takeoffs, landings, emergency squawks, and other stuff. A very early experiment, but I think it&amp;#x27;s kind of neat (especially the RAs!).&lt;p&gt;2. Closest Points of Approach: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;skycircl.es&amp;#x2F;cpa&amp;#x2F;&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;skycircl.es&amp;#x2F;cpa&amp;#x2F;&lt;/a&gt; An analysis tool for checking to see just how close two (or more) aircraft got. For example, if you saw the New York Times Story &amp;quot;How a Series of Air Traffic Control Lapses Nearly Killed 131 People&amp;quot;[1], here&amp;#x27;s a link that visualizes and animates the scenario that happened in Austin, where a Fedex jet almost landed on a Southwest passenger jet: &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;skycircl.es&amp;#x2F;cpa&amp;#x2F;?kmlurl=https:&amp;#x2F;&amp;#x2F;gist.githubusercontent.com&amp;#x2F;wiseman&amp;#x2F;b28e76fbadad13193db5cbd28956988a&amp;#x2F;raw&amp;#x2F;5ce33f0ca300fd3751fce054a6476787875e7d6e&amp;#x2F;FDX1432-SWA708.kml&quot; rel=&quot;nofollow noreferrer&quot;&gt;http:&amp;#x2F;&amp;#x2F;skycircl.es&amp;#x2F;cpa&amp;#x2F;?kmlurl=https:&amp;#x2F;&amp;#x2F;gist.githubuserconten...&lt;/a&gt; My tool estimates they got within about 150 feet (assuming idealized point aircraft without volume!)–The NTSB said they got &amp;quot;within 200 feet&amp;quot;.&lt;p&gt;1. &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.nytimes.com&amp;#x2F;2023&amp;#x2F;10&amp;#x2F;11&amp;#x2F;business&amp;#x2F;air-traffic-control-austin-airport-fedex-southwest.html?partner=slack&amp;amp;smid=sl-share&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.nytimes.com&amp;#x2F;2023&amp;#x2F;10&amp;#x2F;11&amp;#x2F;business&amp;#x2F;air-traffic-cont...&lt;/a&gt;</text></comment>
<story><title>GPSJam: Daily maps of possible GPS interference</title><url>https://gpsjam.org/?lat=45.00000&amp;lon=35.00000&amp;z=3.0&amp;date=2023-10-10</url></story><parent_chain></parent_chain><comment><author>izacus</author><text>Just a note from the sites FAQ: the data is actually showing places where airplanes report LOW NAVIGATION ACCURACY via their ADS-B transponders.&lt;p&gt;Since planes tend to default to INS navigation with use GPS, GLONASS, Galileo or other systems to supplement the drift, it may be subject to certain data skew (e.g. if there&amp;#x27;s an area on the world where most planes aren&amp;#x27;t equipped with GPS navigation system, have poor quality navigation tech or you might be seeing &amp;quot;jamming&amp;quot; where there might just be a common place on airline route where INS drifts).</text></comment>