To use Live Location, start a chat with the person or group you'd like to share your location with. You'll find the new option "Share Live Location" under "Location" when you hit the "Attach" button. You can decide how long you want to share your location, and then hit "Send." If you want to stop sharing your location before the timer expires, you can choose to do so at any time. And if multiple people in your group share their locations with one another, it will all be visible on the same map.
WhatsApp has been steadily increasing in importance. It recently become a top news source in some countries and has a billion daily users. It's nice to see that the company is focusing on that impressive user base and continuing to add new features.