BuddyLocator is a free J2ME (MIDP 2.0/CLDC 1.1) based software for GPS mobile phones that allows you to track family, friends and anyone whom you add to your contact list in the software.
All you need to do is download and install the client on your mobile device, add people to your contact list and set your status to Public, Private or Offline. The people whom you’ve added to your list also need to follow the above mention steps on their mobiles.
This way everyone can securely track people without your or the other person’s privacy being invaded.