Interesting, I never have compass calibration enabled and use maps and navigation quite often all without any issues.I am aware of that, i just wanted to see his reasoning behind his post.
I personally dont even have find my iphone enabled as i have icloud disabled on my iphone 7 plus, no need for it.
I have 3 items enabled the Sytem Service menu, First is Compass Calibration(Maps and navigation apps can't use GPS properly with this disabled so its very important to keep compass calibration enabled), Motion distance for proper fitness tracking and Emergency SOS.