reply to post by boomer135
Comment? Sure. Planefinder seems to have much wrong data.
US506 11:31AMPDT 08/24/2012
No way this plane was flying over the range. I have other examples of bugs as well,
Planefinder claims to use ADS-B. Here is their FAQ:
However, the Janet aircraft are not transmitting ADS-B. They have mode-s and that is about it. So I have to assume Planefinder has the FAA feed for
aircraft that don't have ADS-B, and their program has bugs when using the feed.
Planefinder gets it's ADS-B in two manners. One is it scrapes data from PlanePlotter, apparently with permission. Planeplotter is a cluster-f**k of a
high order. I have that piece of #e software, though I no longer run it due to it crashing. [It took me a while to find all the bugs. Avoid
PlanePlotter at all costs.] The author refuses to fix it, nor will he give me back my money. Worse yet, the license is such that I can't even sell
the program to someone else. Anyway, planeplotter has a "feature" where it interpolates the flight path of airplanes when it loses contact. Well
interpolate is the wrong word. Anyone who knows a bit of math knows that you interpolate between data points. PlanePlotter extrapolates, so it loses
the plane's ADS-B location and just guess at points where it would have gone. How do I know this? Easy, I watched a plane land via a mode-s receiver,
and saw it kept flying on the stupid planeplotter program. You can turn this bug, I mean feature off, but there is no way to tell if the data sent to
the PlanePlotter server came from mode-s boxes with the bug turned on. If I were Pinkfruit (company behind planefinder), I wouldn't use the
Now the other way planefinder works is you can run a program they supply that reads the data from your mode-s receiver and feeds it to their network.
Now that data should be good because Pinkfroott controls the gathering of the data. Essentially it gets the unfiltered feed right from the mode-s box.
Unfortunately, there is no way to tell if the data on Planefinder is coming from PlanePlotter (#e) or Pinkfroot's custom software.
Here is Pinkfroot's commentary on how they get data:
I have no idea what the business plan is for Planefinder, but they have actually bought mode-s receivers for some people to fill in the holes (as in
coverage) in their network.
Note that when mode-s receivers first came on the market, they had a 5 minute delay on the data feed. The screen on your PC was real time, but the
feed was delayed. It didn't take long for someone to do a hack to get around the delay. The manufacturers at that point figured why bother putting
the delay in if it could be hacked, so the feeds are all real time. I don't know if Pinkfroot delays the data they send to to the internet.
Bottom line: Janets do not have ADS-B, so Planefinder is not displaying accurate positioning. You are better off looking at flightaware, flightwise,
or similar websites. They show accurate tracking via the FAA feed until the feed is turned off by Nellis.