IPhone location accuracy

Question

As I develop for the iPhone, I just bought an iPhone 4 to test my application, which should measure the coordinates of my location. I do not have internet (3GS, GPRS or something else ...) on my iPhone, and the problem is that:

1) Without the Internet, I get a horizontal accuracy of 1744 m, and this is very bad. (I also checked accuracy in other applications, and it is always so bad or worse)

2) With WiFi Internet, I get a horizontal accuracy of 80 m.

This is normal? What can I do to improve coordinate accuracy?

Thanks in advance for your help.

Answer 1

From my experience, you need to receive cellular data (3G or Edge) to get the exact location on any iPhone. With this and clear view of the sky, you can be reached within a few meters of your actual location.

Answer 2

Yes, it is normal. To increase accuracy, you can navigate somewhere with a clear view of the sky.

Answer 3

The first thing I would advise is to make sure that you have a clear view of the sky in order to get a good satellite signal.

Answer 4

I think it’s becoming somewhat “accepted” that GPS GPS accuracy is not enough (compared to other handheld computers) ... I had to look for my story, but I remembered reading this very problem in Hacker News - http: // news .ycombinator.com / item? id = 1526664 .

If you do not want to follow the stream, here is the article itself - http://rnr.davidlokshin.com/post/825290568 .

Answer 5

Recently, I found out that the phone needs to download a package of coordinate files in order to really understand the GPS data that it collects. Thus, without an Internet connection, the GPS service is very poor or possibly completely inaccessible.

I would argue that your poor accuracy with WiFi is due to the fact that you were indoors ... It's all the same.