While it can be fun to wing it when on the road and have fun discovering new roads and scenery, it's also nice to know that you will eventually find your final destination. Vehicle navigation systems are becoming increasingly sophisticated with the use of GPS vehicle tracking systems. GPS systems are factory standard on higher-end SUVs and cars, but you can also purchase add-on car GPS units. Car navigation GPS systems contain a car video screen that is large enough to be seen while driving. Since they are powered by your car's electrical system, they can only be used in your vehicle. Like something out of a James Bond movie, automotive GPS systems are voice-powered, so you can keep your eyes on the road while you navigate. The average size of a portable GPS navigation system is about 3.5 inches high, six inches wide, and two inches deep. They can be mounted in your vehicle in a variety of ways. Some use a suction cup mount that is attached to the windshield or dash. They can also be screwed to the dash with a bracket. Others have a beanbag-type base that is attached to the dash with friction. Your navigation systems determine your latitude and longitude and altitude. Position accuracy has little variance from model to model. Sometimes, an inaccurate reading occurs when there is heavy tree cover or a dense group of tall buildings in the vicinity. If you travel either off the beaten path or in cities where big buildings block satellite signals, look for models that have a feature called "dead reckoning." These units will maintain routing directions in the event of loss of satellite lock.
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