FR24 weird plot supposedly for a G115 near Cranwell

[slip and turn]

What sense can be made of the following plot (still live as I post) which caught my eye because it was apparently squawking 7700?:
It was showing a constant 370kts plus when I first noticed it towards the end of its sortie!
https://www.flightradar24.com/CRN26/f71df08
Now it appears to have landed, it is recorded as having landed at NQT but the track terminates near Cranwell (and probably where the flight started) 22 miles away from NQT? FR24 has gained a tremendous reputation for having proven very useful in so many flight tracking scenarios, and we are well used to seeing errors which can usually be explained, but what sort of General Aviation spoofing or mucking about might cause this one?

[DaveReidUK]

What sense can be made of the following plot (still live as I post) which caught my eye because it was apparently squawking 7700?:
It was showing a constant 370kts plus when I first noticed it towards the end of its sortie!
https://www.flightradar24.com/CRN26/f71df08
Now it appears to have landed, it is recorded as having landed at NQT but the track terminates near Cranwell (and probably where the flight started) 22 miles away from NQT? FR24 has gained a tremendous reputation for having proven very useful in so many flight tracking scenarios, and we are well used to seeing errors which can usually be explained, but what sort of General Aviation spoofing or mucking about might cause this one?

The Grobs, like most light aircraft, don't have ADS-B.

So any data you see on FR24 has been obtained from crowd-sourced multilateration which, to be frank, FR24 isn't very good at.

The 7700 squawk may be genuine, or it may simply be FR24 misreporting a 7000 (GA conspicuity) squawk.

[slip and turn]

The Grobs, like most light aircraft, don't have ADS-B.

So any data you see on FR24 has been obtained from crowd-sourced multilateration which, to be frank, FR24 isn't very good at.

The 7700 squawk may be genuine, or it may simply be FR24 misreporting a 7000 (GA conspicuity) squawk.Thanks Dave - if not ADS-B, then a crowd sourced multilateration of what exactly?

[DaveReidUK]

Thanks Dave - if not ADS-B, then a crowd sourced multilateration of what exactly?

Mode S transmissions.

[slip and turn]

Oh dear - I'm almost sorry I asked - that's a whole bunch of extra reading I need to do!

Thank you again, Mr Reid.

[El Bunto]

7700s aren't rare on the Tutor fleet, for various reasons that I think have been discussed in Pprune previously. I think they're handled by the Distress & Diversion Cell so it's also good interop practice for the pilot.

Re: FR24-reported landing site, not only is MLAT a bit of a guesstimate but FR24 doesn't have a comprehensive knowledge of smaller fields. For example some aircraft at my local GA field have full ADS-B and report their exact position at start-up, but FR24 doesn't know that corresponds to an actual aerodrome and so insists that they must actually be on the ground 11 miles away at a Big Airport.