PNA (portable Navigation Assistant) is compared to the firm modular packaging system, mostly delivered from the car maker, a mobile handy navigation system. .Technically seen it is a PDA or a pocket PC with a normally integrated GPS receiver on which you can find however only the navigation application.

The artistry of the navigation was developed about 6,000 years ago, firstly in India on the Sindh and probably contemporary also in Egypt and the today`sLebanon and mainly in seafaring, from the first century on it was also used for expeditions on land.From the year 1500 AD numerous world maps were generated which were always improved and complemented during the centuriesIn the 11th century it was used a compass in China for the first time. In Europe only in the 12th century.At the end of the 15th century the astronomic navigation depending on the sun and the polar star was developed.Up to the year 2004 fifty satellites were brought into the orbit, which are responsible to determine the positions of persons and their receivers on earth, respectively. This satellite network, the global positioning system (GPS) is thebasis of the mobile navigation.

Fifty satellites are responsible for the navigation worldwide.Through the period of the signal transmission, starting froma PNA or a firm modular packaging system to a satellite longitudesand latitudes can be calculated. In the intersection point of the coordinates is the position ofthe signal receiver, the start of the navigation.Theoretically the signals from three satellites are enough,which have to be above of their shot-down angle because out of it the exact position and height can be determined.In Practice, however, GPS-receiver have no clock whichworks exactly enough to calculate the running times correctly.Therefore a signal of a fourth satellite is required.

In the future mobile navigation devices will develop to an all-rounder. To hold automatically the desistance and the lane, communication from vehicle to vehicle and to the traffic infrastructure, an accident calculator of probability, the integration of news systems and self learning input of data - this all is future music, to which the user of a PNA, however, do not have to wait long until it counts as standard in the mobile navigation.