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Indoor navigation

We would like to develop an indoor navigation with BLE. The goal is to get the position of the mobile device and navigate to a specific location.

We have already four nRFBeacon and one nRF51DK. Our idea is to use the nRF51DK as master and the four nRFBeacons as slave.

1.) How many Beacons are necessary to get the exact position of the mobile device(for one room)?

2.) How should the Beacons be placed in a normal room with four walls?

3.) If one Beacon is to far from the master, is it possible to send the information to another Beacon and from there to the master?

4.) Are there already project like the indoor navigation? What are the difficulties? How should we proceed?

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