The Maps JavaScript API has several types of layers: The Google Maps Data layer provides a container for arbitrary geospatial data. You can use the Data layer to store your custom data, or to display GeoJSON data on a Google map. The Heatmap layer renders geographic data using a Heatmap visualization. The KML layer renders KML and GeoRSS
According to GPS technology company Garmin, a GPS technology company, the Global Positioning System works when GPS satellites transmit "a unique signal and orbital parameters that allow GPS devices to decode and compute the precise location of the satellite." From this transmission, GPS devices are able to calculate the location of users by
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