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Minivan


  Navigation Systems 2



What is better, smartphones, GPS devices or permanently installed systems? The latter have become much more affordable. In small cars particularly favorable devices are also available ex works, normally more products for the aftermarket. Advantage for the more expensive integrated ones is the combination with car facilities. So diverse usages are possible via a system with SIM card. In USA one loves the operator that you just can ask. 'At which sight we just passed?'. Really no further need to istrive itself.

In Europe, there are two major companies that determine map data. These are used in increasingly detailed form, especially for the European Galileo system someday. Tolerances of a few centimeters are promised. Presumably such data are needed most for autonomous driving. The monitoring cars for updating are still faster running through Europe, because their cameras are able to produce faster, too. The Google one should be more expensive than the whole car.

How does a navigation system calculate a route? It works with concentric circles and the nodes within them, being symbols of road intersections. Some go only from the starting point, while others at the same time do it from the target. Computing time is saved when taking ellipses, which are oriented more towards start or destination. In the end at least one node falls either into the enlarging start circle/ellipse or the intersection of both.

Of course, the calculation process is significantly faster at highways. It will be more difficult at the connection point, as users probably expect the shortest route to the motorway and less consideration of the overall destination direction. The roads are graded into categories and for each is saved a time schedule or a conversion into driving cost. 04/16



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