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Location sharing and updating in iphone iOS 4

iOS Devices (iPhone, iPod touch, iPad)

On the native application, which you can download from the App Store:
Enable location services on your device by going from your Home screen to Settings >General and turning "Location Services" to On.
Open the application and sign in to your Google Account if you haven't yet (Google Apps users learn more).
Enable background location reporting by going to Settings > Background updating > and turning to On.
Note: the native application will run on the iPhone 3GS, iPhone 4, iPad, and iPod touch (3rd/4th generation), with iOS 4+. However, background location updating is only supported on the iPhone 3GS, iPhone 4, and iPad 3G.

Your location will only update in the background when you're moving (exceptions: when you switch the app from foreground to background mode, or go from a "moving" to a "stationary" state, the app will continue to update your location for a few minutes). The background location update frequency isn't a fixed amount of time. The update frequency is determined by several factors, such as how much battery life your phone has, if you are moving, or how fast you are moving. Background updating will only use cell ID or WiFi location detection depending on your device. GPS will not be used in the background to preserve battery life.


http://www.google.com/support/mobile/bin/answer.py?hl=en&answer=136647
http://itunes.apple.com/us/app/locationminder/id383031428?mt=8
http://venturebeat.com/2010/06/21/loopt-iphone-background/

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