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USER’S MANUAL XNAV3550 

Before you begin 

- 7 -  

The time of complicated and frustrating inquiries on the right way 

in folded maps is over. From now on XNAV3550, your 
navigation system, will guide you, based on satellite information, 
quickly and safely to your destination. 

  

The Global Positioning System (GPS) network was originally been 

developed in the 70s, as a weapon guidance system for the 
American armed forces. 
GPS is based on 24 satellites, which are in orbit round the earth 
and which are permanently emitting signals. The GPS receiver 
receives those signals and calculates, based on the runtime of 

the signals, his distance from the respective satellites. This 
information serves for calculation your current geographic 

position. 
The signals of at least three satellites are needed to determine 

the longitude and the latitude. With the signals of at least four 
satellites the elevation may be calculated, too. The determination 

has an accuracy of about 9 feet. 

The delivered maps contain the geographic coordinates of the 
points of interest, streets and cities they represent. Thus the 

navigation system can calculate a route from a given start point 
to a given destination point. 
In case your navigation system receives the signals of at least 
three satellites it may determine your current position and 

represents it on the map. This position may then serve as start 
point for navigation purposes.  
As the determination and representation of your position is 
carried out once a second, you may watch your movements on 
the map.