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I have to write an application for iphone that tracks the movement of the iphone itself, given its initial position, without ever using GPS. That is, I can only use data provided by the gyroscope and the accelerometer. The distances I need to measure are rather small and the precision I'm looking for is 40-50cm (~2 feet) at the very most.
Is this possible? If so, what's the best way to go about it? Also, do you know of any existing (and possibly open source) projects that have implemented this already?
Thanks a lot!
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The Health app gathers health data from your iPhone, Apple Watch and apps you already use, so you can view all of your progress in one convenient place. Health automatically counts your steps, walking and running distances. And, if you have an Apple Watch, it automatically tracks your Activity data.
The answer is yes, you can track an iPhone without them knowing by using the Find My iPhone app. This app is designed to help you locate your lost or stolen iPhone. You can also use this app to track someone's phone without them knowing. All you need to do is log in and select 'Find my iPhone.
Here's how: Go to Settings > Privacy, then select Location Services. Select an app, then turn Precise Location on or off.
GPS and cellular location are available on iPhone and iPad (Wi-Fi + Cellular) models.
If you integrate the acceleration twice you get position but the error is horrible. It is useless in practice.
Here is an explanation why (Google Tech Talk) at 23:20. I highly recommend this video.
I answered a similar question here and here.
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