How accurate is GPS?

The answer to this question is constantly changing with the advance of technology and the laws of the United States. The first consumer GPS receiver on the market were far less accurate receiver available today, even if the satellites are the same. Even before 2000, the military deliberately introduced the inadequacy of the civil GPS signal for "Security". They called this a deliberate error signal "Selective Availability". InMay 2000 President Clinton's decision to shut down a SA and provide access to civilians increasingly accurate GPS signals. The military still have the option to disable or errors in GPS signals at any time and without notice, but this feature is usually used only for specific reasons of national security.

The best GPS technology available to consumers in 2007 reached an accuracy of 15 to 30 meters under normal conditions. Garmin,currently the most popular manufacturers of GPS receivers, GPS devices have their requests with an accuracy of 50 feet, 95% of the time. Even within the GPS receiver product line information accuracy Garmin differ due to different receivers in the design of chips used differently.

GPS-accuracy GPS receiver design concerns

If you are a consumer GPS unit to find more accurate, it is important to note the type of chip units.The latest technology in chip GPS receiver, SiRF's SiRFstarIII. With this chip in your receiver and WAAS-enabled, you can expect precision to achieve the best GPS available for levels under current conditions.

Environmental factors influence the accuracy of GPS

Many different environmental factors can also affect the accuracy of the GPS receiver. Leafy trees, tall buildings, deep canyons, and in any place where the sky is your opinion oninfluence is limited to how accurate the GPS device. The weather can degrade the accuracy of the GPS device.

As you can see, there is no simple answer to the question "How accurate is GPS?". But now you know the most important factors that could affect the accuracy of GPS.

Thanks To : Garmin nuvi 285W-285WT