Navigon MN4 - Manual (Page 12)

User's manual BLUE Edition
Installation and quick-start guide - 10 -
2.1 Operating mode of your navigation system
MobileNavigator The time of complicated and frustrating inquiries on the right way
in folded maps is over. From now on MobileNavigator, your
navigation system, will guide you, based on satellite information,
quickly and safely to your destination.
GPS-based
navigation Based on satellites the Global Positioning System (GPS)
determines your current geographical position. The GPS has
originally been developed as a weapon guidance system for the
American forces.
Operating mode of
the GPS The GPS is based on 24 satellites, which are in orbit round the
earth. They are permanently emitting the time and their current
position. The GPS receiver receives this information and
calculates the longitude and the latitude of its own actual
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 3 yards.