Where is the documentation of the options on the 'System Services' settings screen?

The settings screen Settings ▸ Location Services ▸ System Services in iOS 5.0 contains the following boolean options:
Cell Network Search
Compass Calibration
Diagnostics & Usage
Location-Based iAds
Setting Time Zone
Traffic
I have never used an iPhone before and do not understand what each of these services do. Where can I find Apple's documentation of these options?

As I say, I've disabled all of them and see no need for any of them.
As far as I have been able to determine these are being used to build up location based databases for use in advertising, marketing and other commercial uses:
Cell Network Search - tracks the cell towers you are connected to and your location to aid in building up a database of cell phone tower locations and useage
Compass Calibration - this one I have no idea about.  It is absolutely not necessary for the actual act of calibrating your compassapp, and your compass app works fine with it disabled.  Why anyone would find it useful to know where I was when I had to calibrate my compass, I have no idea.
Diagnostics & Usage - this one is obvious, and is used to tag your location if you have chosen to send diagnostic and usage information to Apple.  I can see where it might help them to know where you were when you had some issue (ie. so they could see if the area correlates with frequent network errors or such)
Location-Based iAds - also obvious, but I don't want marketers targeting me with ads based on where I am,  I find internet advertising far too intrusive as it is, I have no desire to aid them in pestering me even more.
Setting Time Zone - this one I don't get.  If you have data & time set to "automatic" this is pointless, as they date and time (and hence time zone) will be set by your devices connection to the cell tower(s).  I have no rational thoughts as to what this being used for, or what good it may do.
Traffic - this is apparently somehow used to update a database of traffic patterns.  How it knows what the traffic around me is, I do not know - ie. what triggers it, I have no idea.
Anyway, I have them all disabled, as I can see no rational reason to have any of them on.  They just needlessly use up my battery, and are sending data to places that I have no idea of or about, for purposes I have no clue about, all of which, going by the complete lack of information about them, is by design (which just irritates me - at least explain the dang things or don't bother even including them).

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