How does the personal gps system work such as garmin, tom tom, etc.?

I am familiar beside the basic assumption of the reception of the satallite signals to locate a spot on the earth. I am interested within knowing how the actual car equipment stores so much info and how the directions are created. In appendix to the actual map routes being loaded, how does the system know if the road is 4 lane or 2 lane and where on earth the crossovers are on a 4 lane. How does the system know where turns are excluded, etc.

Is at hand a traffic website?

Answers: Garmin uses Navteq navigational software to produce maps and directions. The map/roadway information is stored and the directions are calculated using this information. The information is compiled using satellite metaphors and highway information built into the software. The software looks at current position, destination and available roadways between, applying logial analysis to determine the best route. This is why the GPS units can recalculate on the fly, because they look from where on earth they are, not where they be.

Directions examine please sustain, truck drivers, bus...

Its all programed within to the gps just similar to a computer is they have cars drive the country near gps locators on them and record the drive later they aply that to the program and then download to the gps

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