September marks the 50th anniversary of the Global Positioning System, a U.S.-owned free utility that offers positioning, navigation, and timing services to users all ...
that they can both take down the satellites and interfere with the signals. Hacking it has never been easier.
Now firefighters and ambulances use GPS to get to your house in an emergency. Back in 1973 they used maps. In addition, automakers ranging from Jeep to Mercedes can track cars with GPS, notify them when maintenance is due, and slow or disable them if they are stolen. Even surveying and construction now use GPS. Surveyors can take measures that are beyond line of sight by carrying GPS devices or by using survey stations. Construction companies can GPS for digital blueprints, which can help workers pinpoint locations of studs and nails, reducing mistakes. GPS use for tunnels makes it easier to ensure that a tunnel started on both sides of a mountain meets precisely in the middle.
GPS can even measure climate change by measuring the relation between snowfall and ice mass. University of California at San Diego scientist Susheel Adusumillusing GPS, one of many examples. Reflectometry, which uses GPS, can measure changes in snowfall; vegetation; ice coverage; and soil moisture.
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