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Think about a GPS device. What are its features? Here are a few: Real-time tracking: a GPS makes changes minute by minute based on where you are at present Trip history: the device keeps track of where you've gone previously Alerts: a good GPS will alert you when you're speeding, if there is a traffic accident ahead, or other elements to watch out for Route: oh yeah, a GPS will tell you the best route to take to get where you're going Re-Calculated Route: and, critically,