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Posted by: Dan Aug 22 2008, 06:08 PM

I am trying to find accurate information on the refresh rate of the GPS on the iPhone 3G. I need to know how often the system updates your position, and how accurate it is (i.e. to within x feet). Are there any factors that affect the refresh rate or accuracy? Are there ways to control/improve the refresh rates/accuracy? etc.

I am working on an app that requires real time GPS tracking of multiple parties on a map. There are several apps that show the position of various other parties, but I can't tell how accurate the position is, or how often it is updated. Does anyone know of any published information from Apple that would answer these questions?

Thanks,

Dan

Posted by: Nipz Aug 22 2008, 08:21 PM

Ive searched everywhere and i cant find anything on it!?

Someone must know. Try emailing/ringing apple support maybe?

Ill keep trying to find out for you, and if you find it first can you please post what you find out?

Thanks

Ben

Posted by: Dan Aug 23 2008, 12:15 AM

I have spent some time today searching various developer forums and iphone app forums to see if I could find any answers. It appears from anecdotal evidence that the refresh rate is around 5 seconds. At least that is what several people reported from several apps that track real time movement on google maps. Accuracy is a different matter, and seems to be affected by a variety of factors. In best cases, the GPS seems to be accurate within 10 ft. That requires that you are outside away from tall buildings and in a 3G covered area. It also appears that the various bug fix updates to the firmware are having a significant impact, both good and bad, on GPS accuracy. It looks like it will be a while before all the kinks are worked out between Apple's firmware, and AT&Ts network, and the GPS function. Once they fix all the problems, it looks like this will be a pretty decent sat nav device. I'll keep researching as well. Let me know what you discover.

Posted by: Nipz Aug 23 2008, 07:49 AM

5 sec and around 10 foot is what I found out from different places too.

Shame apple haven't released offial details really.

Ben

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