Lots of Cessna aircrafts circling Montreal not showing on map anymore

[arthur.78]

Hello,

There are usually a lot of small, low altitude (500ft?), Cessna aircraft that circle around Montreal (Mount Royal mountain, to be precise) daylight and evening. These are usually from a school or private.

I used to spot them easily on flightradar24 for years, however, it has been a few months (a year) that none of them show up on the map anymore, despite seeing and hearing them doing the usual loop above Montreal city.

Is ADS-B not mandatory anymore for them?

Thank you!
Arthur

[Oblivian]

You will probably get the boiler plate 'receivers/can turn off..' etc etc

If they were only MLAT, it will be because they told everyone to stop feeding mlat if they feed other sites.

So thousands of GA vanished.

[abcd567]

I disregarded their instructions to turn OFF mlat, even though I am feeding other sites as well (Flightaware, Radarbox24, Planefinder, Adsbexchange, Opensky-network etc)
Here is the result:

fr24-mlat-on.png

[Oblivian]

Ahh yes, but We know what to look for to stop feed injection and think it out.

Everyone else just blindly follows various guides to add allll the feeders and have no care.

Add that to a badly configured input detection (or possibly non existent) feeder app, you're left with asking everyone to turn it off instead.

[abcd567]

Ahh yes, but We know what to look for to stop feed injection and think it out.

Everyone else just blindly follows various guides to add allll the feeders and have no care.

Add that to a badly configured input detection (or possibly non existent) feeder app, you're left with asking everyone to turn it off instead.

3-thumbs-up.png
Yes, very true


.

[Bosi72]

Not sure in Canada, but in Australia mode s transponders are still not mandatory. Mode a/c is minimum for controlled airspace, but those are not picked up by adsb receivers.
Transponders can be switched off too Hope this helps