Google Latitude for iPhone is a mobile client app running on iPhone Safari. You can see your location by logged on to your Google account and track your friends’ location whom you’ve added to your friends list.
Launch your iPhone Safari and enter google.com/latitude at URL address field. Sign in using your Google account and press the blue dot on the bottom right to see where is your location. You must turn on Location Services to allow Safari to determine your location. Use the left and right arrows to track your friends’ current location. On the menu, you can also do a simple map search and get the direction.