The New I phone app store has you turning on your GPS before you can down load any apps.
My thinking is at some point they are going to sell GPS information to vendors like starbucks and as you are near one your phone will buzz and you will be sent a coupon good for the next 10 to 15 minutes at this or that location.
As for being tracked, sure no matter where you go or what you use some how there is a record of you moving along the roads, your purchases - either credit card or bank card, not to mention the store discount cards all track your movements and purchases.
Even rail passes, subway token purchases, and tolls with easy pass are going to track your movements.
great way to establish an aliby.
On the other hand, use cash that you get for the month, use public transportation, and do not sit next to a window.
carry a burner cell phone.