Post #506792

2026-03-03 08:47 UTC

It’s not as clear-cut as most people here are saying. In short, GPS itself is just listening to satellites, and nothing is leaked that way, but most modern phones use “Assisted GPS” of some sort. The most common (I believe) AGPS is SUPL, which seems to be used by most phones. This involves sending your approximate location to an Internet server, which returns satellite data based on that approximate location. To nobody’s surprise, in Android this is a Google server. I’m pretty sure most Android distros don’t give you any control over when it’s used, or which servers it uses. Anecdotally, my phone without Google Play services has a horrible time obtaining a GPS fix, so I suspect without GPlay it’s only using raw GPS, but I’ve not bothered to actually dig into it. As I understand it, SUPL means even if you’re in aeroplane mode, if you have an Internet connection over WiFi you might still be leaking (approximate) location data when using GPS. I learned about this from this excellent series of blog posts, which is a very thorough comparison of various Android ROMs’ privacy. It has a background section (search for “Assisted GPS”) in each of the ROM-specific posts which explains it better than I can.

Replies (4)

@mastod0n@lemmy.world 2026-03-03 11:40

Thanks. One question though: is this assistet GPS the same as RTK services?

Open ##507168
@doubtingtammy@lemmy.ml 2026-03-03 16:00

Anecdotally, my phone without Google Play services has a horrible time obtaining a GPS fix, so I suspect without GPlay it’s only using raw GPS, but I’ve not bothered to actually dig into it. If you look at an app that shows satellites being recieved, it’s pretty cool to see how sensitive the GPS signal is to objects. Inside, maybe I’ll get one or two satellites near a window. But then I step outside, and see the list rapidly grow. I think my degoogled lineageos still has an assisted GPS option, though I haven’t tried it

Open ##507810
@pineapple@lemmy.ml 2026-03-05 11:07

Great. So even if I dont use google maps I still get tracked by google. I should really look into getting a custom rom.

Open ##536031
@podbrushkin@mander.xyz 2026-03-09 14:23

Always wondered why my Chinese smartwatch quite often tells me to open Chinese spyware app because “satellite data outdated”. Looks like it’s an “assisted GPS”.

Open ##600306