How to turn your iPhone into a GPS location-tracker:
The key to using your iPhone as a real-time GPS location tracker is the Find My iPhone service which is part of iCloud. Most people have probably heard about the Find My iPhone service -
Apple markets the service as a way to find your iPhone if it becomes lost or stolen - but what many do not realize about the Find My iPhone service is:
You can use Find My iPhone to get real-time maps of where your iPhone is at any time. You do not have to 'report' the phone as stolen.
You can get the location of your iPhone as often as you wish, with no limits
There is no limit to the number of iPhones you can track - they don't even have to be owned by you! Just remember: do not track a phone/person without that person's permission.
Should the iPhone owner catch on that you are tracking their every movement, the information they need to convict you will be stored in the iPhone.
How to setup location tracking on an iPhone:
On the iPhone you want to track, go into SETTINGS, then iCloud
Enter your iCloud account information
Scroll down through the iCloud options (contacts, calendars, etc) and make sure that Find My iPhone is ON
Your iPhone is now setup as a location tracker!
How to find and track the location of your iPhone:
From any computer connected to the internet: From any browser go to
www.iCloud.com and sign in with your email address/iTunes account and password. Once signed-in select Find My iPhone. When prompted, re-enter your password. After a moment a list of all devices you have configured for tracking will show on the left of the screen. Click the device to track - after a moment a map will appear with the location of your device pin-pointed in the center (this usually takes a few seconds). If the iPhone is in motion it will not be updated live on the screen - click the refresh button near the upper-right (near the time) to update the location.
From another iPhone or an iPad: Download and install the free Find My iPhone app. Start the app and enter your Mobile Me membername (email) and password. Select the device to track from the list and a map will appear with the location. To update the map/location, click the refresh-button in the lower left.
When tracking on either a computer or another iPhone or iPad: on the map, select "hybrid" view for the best map view.
Hope it helps