ios - Really accurate speedometer on iPhone -

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I would like to develop a mobile app for iPhones, which calculates the time required for any velocity. For example: I'm in my car, I open the app, select 100 km / h and when I speed up the app then the time should start counting and when I reach 100km / h then at that time The countdown is closed. It should be very accurate.

I have heard about two solutions that I have to use the accelerometer / guoroscope first, but some people have told me this bad idea, because I will not be able to calculate the time in long distance. The second option is to use GPS, but on the other hand it can not be as accurate as I want it to be. I want to suggest, which option is better and why

My goal is iPhone 4S and newer

If you want to be more precise than GPS, then you will need some type of sensor. Most of the same apps and concepts build a receiver that plugs into a connecting car on the iPhone. The advantage of making all the sensors in the car available to you is this: This is an example:


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