🇺🇸 People stop me on the street all the time and ask me, Stef, how can you tell where in the United States there are too few #ADSBexchange receivers to geolocate aircraft that aren't broadcasting their precise location data using multilateration (#MLAT)?
Great question!
Here's what you do:
filter by altitude, between 10,000-40,000 ft, that restricts the results to aircraft which are flying high enough that we should home four or more receivers are in line of sight, a requirement for #MLAT.
Then filter so you only see the Mode-S-transponder-transmitting aircraft
We can tell more or less where they are, somewhere around the loop they're doing over Washington and Montana, but over on the left under Signal you see they have 1 receiver that's got them in line-of-sight (LOS), and #MLAT requires 4.
If you wanted to pick up the rough location of that aircraft you'd need to deploy another 3 receivers to locations beneath/nearby their flight path so you *might* get 4+ receivers to collect their Mode-S transmissions simultaneously and estimate their location in the sky.
Wherever you see a Mode-S plane icon, there's a need for another ground based receiver, to try and use multilateration to derive their real location, Mode-S locations on the map are only accurate to *hundreds* of km.
(NB: multilaterate = 4 data points, triangulate = 3 points)
There are 140+ other aircraft worldwide in the same boat right now. If you live near any of these plane icons, consider deploying an #ADSBexchange receiver to collect the transmissions from the planes above your house. inaccurate.adsbexchange.com/?filterAltMin=…
How to set up an SDR receiver to collect ADS-B / Mode-S transponder data and feed the data to #ADSBexchange.
🇨🇦🇮🇱 About an hour ago #RCAF CC-130J Hercules 130603 #C2B53F fell victim to Israeli GNSS/GPS spoofing & jamming. 130603's transponder ceased transmitting accurate position data, then stopped transmitting position data at all. globe.adsbexchange.com/?icao=c2b53f&l…
It is unclear if flight #CFC2503 is air-dropping relief to Gaza, or transiting near #Israel.
It is clear that Israel is not pausing their months long electronic warfare attack on all civilian and military aviation in line of sight, and the media doesn't want to mention it.
(link showing documented GPS jamming will only work after March 13, ie, March 14+) h/t @lemonodor
🇨🇦⚓ Royal Canadian Navy Harry DeWolf-class arctic and offshore patrol vessel HMCS Margaret Brooke departed Halifax on January 12 for a six week #OpCARIBBE deployment. 🧵
🇨🇦⚓️ Where #HMCSMontréal has been since March 26, when they departed Halifax on #OpPROJECTION, using @MarineTraffic AIS-T and AIS-S data. 🧵
This thread serves as a guide, to you the reader, of what to look for in Royal Canadian Navy communications; it's your crackerjack box secret decoder ring when they're vague.
All of this information has been broadcast by the ship's AIS transponder over the airwaves, picked up with every SIGINT satellite in orbit, military and commercial, every plane in line-of-sight(LOS), collected by every significant adversary, and included in a dossier with other intelligence, that was reported up their chain of command, before I woke up this morning.
Our military and government public affairs officials can, without compromising national security, speak plainly and include everything up to (at least) this level of information, because every adversary already knows; they told them. They got the memo.
This is also the minimum amount of detail that the public should expect in any media story about HMCS Montréal's deployment; all this information is at journalists' fingertips too. Public affairs should be more forthright to make journalists' lives easier. This information isn't a secret to the outside world.
🇨🇦⚓️ #HMCSMontréal arrived at the Port Said anchorage on April 17, traversed the Suez Canal into the Red Sea on April 18, then stopped transmitting AIS from April 19 until they arrived in Salalah, Oman on May 8. #OpPROJECTION
🇬🇧 41% (9) of the RAF A400M Atlas fleet of 22 do not fly. Of the remaining 59% (13) that do fly, some of them are deployable, and some are homebodies doing training and certification. #ZM406 returned from the Airbus depot in Getafe, Spain 🇪🇸.
🇬🇧 RAF C-130J Hercules #ZH869#43C198 was sent to Cambridge 🇬🇧 to be decommissioned, bringing the number of Hercs remaining to 5, all of which are flying regularly, except #ZH870#43C04C hasn't flown in a week.. maybe they're next? 🪦
+ No coverage of the Herc flight to Benghazi.
🇬🇧 Only RAF C-17 Globemaster (#ZZ172#43C172) hasn't flown for over a month; it's probably undergoing indepth maintenance. 88% of the fleet is regularly in the air.
Hasn't anyone thought about the implications of what the government admits to doing?
Forget that they factually, deliberately, stopped transmitting Mode-S/ADS-B to hide their "training" operations over Ottawa; what is their data retention policy, on the data they collected from… twitter.com/i/web/status/1…
Let's review the flight data that shows the arrival of American-registered N330TT #A3978A call sign CAVE033 operated by MAG Aerospace (per contract) from when they arrived in Ottawa on Tuesday January 25, 2022 from Hagerstown, Maryland - immediately before the arrival of the… twitter.com/i/web/status/1…