Anomalies like high static discharge during lightning storms, humidity, ionized air and barometric pressure can definitely cause false information, data error or miscalculations. A satellite signal slows as it passes through the atmosphere. Ionosphere and troposphere delays may cause distortion. GPS units normally will not work indoors, underground or underwater.

In automotive GPS receivers, metallic features in windshields, such as window tinting films or defrosters elements can degrade reception inside the vehicle. Receiver clock errors are also common. This type of error occurs because a receiver’s built in clock is not as accurate as the atomic clocks onboard the GPS satellites and will reflect varying timing errors. These distortions can result in positioning errors of hundreds of miles.

Unreliable data is also a major contributor to GPS errors. With an incalculable number of roads and millions of miles of ground to cover, it is impossible for any data system to be 100% accurate. A road network is a constantly changing entity; roads are diverted or closed, construction reroutes traffic while weather affects road conditions. The data feed used in GPS units is dated. Fresh updated content may not be available for several months. It is important to remember that this data is updated quarterly at best and in some cases only released twice a year.

Although GPS Navigation is becoming increasingly popular, these units have the ability to highlight human error. A GPS devise will attempt to advise you depending on the destination your have entered. An incorrect address or a mistake in spelling are common errors. Instead of making our lives easier, some of these devices are so technologically enhanced they are very difficult to use. User mistakes account for the majority of GPS errors, however a GPS receiver has no way to identify and correct these mistakes.

GPS technology isn’t perfect! It’s imperative to pair its directions with a healthy dose of common sense. Many drivers exhibit a surprising willingness to rely on gadgets instead of experience. They are finding that satellite navigation may replace paper maps, however following the GPS’s not always reliable directions, many users are getting hopelessly lost, hitting dead ends or road closures and even swerving into oncoming traffic.

Even if you are not blindly following erroneous, computer-generated instructions, research studies tell us that "using GPS while behind the wheel is actually more distracting and less safe than unfolding a paper map and using it to find your way". A large portion of drivers, according to the study, relied exclusively on their GPS unit for directions, "rendering them completely oblivious to the world around them".

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