Sharing your location with friends can be a valuable tool to help you meet up somewhere, or just to let a loved one know where you are and when you'll be getting home. To share your location, go to your text conversation and tap Details in the upper right corner. A box will open with a number of options.
Tap Send My Current Location to send your whereabouts just once. To let someone follow your movements use Share My Location. You can share your location for an hour, until the end of the day, or indefinitely.