[Symbiote]

Many phones with data service switched off, which might be the case when driving abroad.

[Bud]

Data service has nothing to do with a GPS fix. Nothing at all. No data is used. GPS does not require any internet connection at all.

[ropiku]

You are technically true but if you don't have internet connection to get the almanac (future position of satellites) you have to wait 12.5 minutes to download it very slowly from the GPS itself. That's what parent was saying. It works but the time-to-fix is very high.

[mynewtb]

AGPS uses data service to get the almanac.

[Bud]

Thank you. I learned something from this. How often does that almanac need to be updated, however?