To see someone's location on Google Maps, you must first have access to their location data through a sharing feature or an app that tracks their location. Once you have access, you can open the Google Maps app or website and use the search bar to input the person's name or their location information. If they have shared their location with you, you can see their real-time location on the map. Alternatively, you can use a tracking app that allows you to see the person's past location history and receive notifications when they arrive or leave certain locations. It is important to remember to respect people's privacy and only use location-sharing features with their consent.