A newly-deployed satellite has created the most-detailed map yet of the ocean floor, finding hundreds of hills and underwater volcanoes that were previously missed.

The best GPS units offer reliable ... including topographical and off-road-specific maps, the ability to mark customizable routes and waypoints, and access to satellite communication features ...

A new Chinese satellite known as Fengyun-3E is using some ... Plenty of weather satellites broadcast their maps and data unencrypted on radio bands that anyone can access.