Apple has an Indoor Survey app on the iOS App Store, designed to help pinpoint locations inside a store, restaurant or other business – but it doesn’t show up in a search, and you need to register in Apple Maps Connect to download it.

By dropping “points” on a map within the Survey App, you indicate your position within the venue as you walk through. As you do so, the indoor Survey App measures the radio frequency (RF) signal data and combines it with an iPhone’s sensor data. The end result is indoor positioning without the need to install special hardware … 

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