Why do I need Compass Calibration exactly?
Okay, what about diagnostics and usage? That won't affect anything if I turn it off right?
The only thing I keep On is the Cell Network Search
so when I take a Photo they are organized by Places in Photos app
What exactly leads you to believe that having Location Services marked "on" for your Camera app doesn't already accomplish this function?
I believe Traffic, Diagnostics & Usage, and Cell Network Search are for crowd-sourced data. They do not effect how your iPhone works, but just provides Apple with a bunch of data about how the iPhone is used, exactly where it is used, and when it is used.
I am unsure exactly what Compass Calibration does. I woke up today with an arrow on my iPhone. I looked in System Services and my Compass Calibration was being used. Why exactly was this being used right when I woke up? I wasn't using my compass or any app that uses the compass (unless my alarm clock does). Needless to say, I shut it off. And my compass feature within the Maps app still works.
iAds and Time Zone are self-explanatory.
Since Apple gives us the option to turn these features on/off, I wish they were more transparent in what exactly these options do.
What exactly leads you to believe that having Location Services marked "on" for your Camera app doesn't already accomplish this function?
The only thing I keep On is the Cell Network Search
so when I take a Photo they are organized by Places in Photos app
if you turn compass calibration off, it won't do this, and that setting it will only be used when you have to calibrate the compass, so if you don't calibrate the compass, it will never do anything anyway, so what's the point in turning it off, just means if you do need to use the compass, you'll have to turn it back on again.