What's the legality of this? I was thinking of doing something similar but with POCSAG but from what I can tell it would be illegal because of ECPA(Electronic Communications Privacy Act)
Explicitly legal. ECPA has an carve out for listening to aeronautical radio traffic:
18 U.S.C. § 2511(2)(g)(ii)(I/IV):
"It shall not be unlawful under this chapter or chapter 121 of this title for any person to intercept any radio communication which is transmitted by any station for the use of the general public, or that relates to ships, aircraft, vehicles, or persons in distress;... or by any marine or aeronautical communications system."
ACARS isn't ATC traffic. It's semi-private communications with airline company dispatch. Text-based ATC communications is done over a different system called CPDLC (FANS-1/A).
That said, this is no different than listening to any other unencrypted, non-cellular radio traffic. Totally legal everywhere (except a few rare exceptions, like the UK).
And as I mentioned in my other comment, in the US the ECPA specifically says you can listen to aeronautical radio traffic.
> Totally legal everywhere (except a few rare exceptions, like the UK).
And (after a cursory search) Spain, Portugal, Germany, Austria, maybe France... In other words, legal in some places, illegal in others.
> Text-based ATC communications is done over a different system called CPDLC (FANS-1/A)
ACARS is both an application and a (legacy) lower layer suite of protocols supporting it, but modern ACARS versions and CPDLC can use the same underlying digital channel, as far as I understand (i.e. VDL Mode 2).
As a result, many of these tracking sites can capture both, as well as presumably "legacy/analog" ACARS.
Not sure about the details, but I suspect it's more a consequence of laws on telecommunication privacy from analog days being very generic than a specific intention to make ATC listening illegal. Opt-out vs. opt-in by frequency and/or purpose, essentially.
That said, it's supposedly still being very much enforced against e.g. planespotters at airshows in some places – no idea what the point of that is.
The ones recorded in the US probably are legal to listen to and the ones in the UK probably are not. I think I remember reading somewhere that it’s not legal to record ATC in the UK. IANAL SIUKRTCL
I am in a similar boat, from what I can tell you can disable the Gemini app here[1] but if you want to disable it in Gmail and Drive you need to have an enterprise plan then you can disable it here [2]
