Each time you launch Maps application, your location will be determined using GPS and your Latitude status will be updated. You can tap Menu Key > Latitude in Maps or Home Key > > Latitude to see your status as well as that of your selected friends.
In Latitude, tap Menu Key to refresh friends status, see them on Maps, add new friends, or change privacy settings.
You can also turn off Latitude service by tapping Turn off Latitude in Privacy settings.
78