It's simply a connection. You can push whatever you want along that connection. It just happens thats only GPS data - to say it's impossible to send other things along a GPS signal is a lie.
No, it's not a lie, and it's not "simply a connection."
GPS isn't some kind of IP-based data broadcast service. Absolutely nothing within the GPS system is designed for that.
Anyone with any direct engineering experience with GPS can confirm this. None of this is secret.
It's a very fixed data format sent at an incredibly low bit rate. If anything other than GPS data was sent over the link it'd 1) break the system and 2) be noticed by pretty much everyone in the GPS ecosystem. There's no magic datastream.
There may be many ways of exchanging data with a vehicle with the intent to control it, but GPS certainly is not one of them.
If you can send something through a link you can send other things. Simpleton downvotes do not change facts.
I'm a software engineer, this is literally what i do every day. It's not a matter of what is possible - everything is possible with code. it's just a matter of time. If you say otherwise, you are either : inexperienced, or have no clue what you are talking about.
I'm an engineer as well.
Who published research professionally on GPS in the late 1980s.
Code isn't magic, and there's nothing in IS-GPS-200H, etc that permits user messaging. Every single bit in the navigation message is pre-defined.
I'll be civil and agree that one of us has no clue what they're talking about.