Originally Posted by
Cloudship
Has anyone actually tried using their phone's GPS without having data or wifi turned on? I know many phones have an actual GPS receiver, but they also use AGPS as their primary source to get an accurate fix. Has anyone tried downloading a map, then taking the phone offline completely and just activating the GPS? How did that work in a city - is it fairly accurate?
Worked fine on my iphone in Hawaii, had data turned off as I'm Canadian, downloaded the route I had to drive via wifi in the hotel, then as we were driving my SO was looking at the GPS tracker signal in google maps and told me where to turn. It lags a bit, bit not more than like 100m at most. Worked fine. Accurate in a city as long as you're not speeding, we also used it in San Francisco as we were walking/biking.