[riuk]

Hi everyone,

my problem is quite a small one but i want to know more about how the GPS works.

I know actually all the basics like GPS and A-GPS.
When i use my phone for chatting (most likely Facebook chat) i have most likely not a direct line to the satellites because i chat only with my friends when i use the subway home from work and i use LTE because i have a nice contract with a lot of download volume.

When i enter the subway and finally the train arrives i start i chatting but i always get the same location where i should be. Its every day the same location within 5 meters accuracy but it is 1 mile away from my position. I am in the subway moving and i am not sure why it is always showing the same location.

Maybe it is the last location of the cell tower i was connected?
Or is it because it is the place where the subway cell tower is?

I really dont know how that actually works but i realized that when i am moving in the subway sometimes i have no lte but a gprs. but when i move trough a big station on the subway line the position jumps to my actual position and stays there again until i arrive on the next major station. Smaller ones doesnt reset it.

When i use after that a normal train it is always right on point and i dont have any problems with the phone or the gps either because it is really accurate.

Thank you in advance.

Riuk

[kch50428]

When the phone has no location available from GPS satellites, the location it will use is either that GPS location of the wifi node you're connected to, or cell tower.

[riuk]

Thank you a lot. I did not connect to the subway wifi.

So i guess it was the last cell tower where i was connected to?
Because the thing is : It shows a place near my work but i have a a good connection in the station downstairs and after i enter the train, where i can start chatting, it does shows the place from before again. Maybe it is like that because it was the last time i was on the surface? Or does it show the last cell triangulation because that wont work in the subway?

[kch50428]

It will show the last known position until it gets a good, known position.