You can use the cell towers to assist in mapping it correctly too as they are fixed position and the location is well known. Pretty sure the QCOM patents on it

You can use the cell towers to assist in mapping it correctly too as they are fixed position and the location is well known. Pretty sure the QCOM patents on it are out of patent by now. Not sure if the android/ios api will expose the whole list of towers the chip can see though. The chip can do it though.