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What does HD Traffic mean?

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HD traffic stands for High Definition traffic

It is a service that has been put into the market by TomTom (the full service is TomTom HD-Traffic as well). TomTom HD Traffic offers traffic information on the entire major road network in the Netherlands, including all secondary "N" roads. The supplied cover is up to 10x better than with TMC, and refreshes every 3 minutes. Read more about HD-Traffic on the TomTom website. TomTom HD-Traffic

What does GPS mean?

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GPS means Global positioning System

GPS is developed by the U.S. Army. It is a system of satellites in permanent orbits around the Earth. Every spot on Earth always sees at least 3 satellites, which are also needed to be able to do a positioning. This is done by means of radio waves and the fact that the position of the satellites is known. Read More