Navigon 81XX - Manual (Page 14)

User’s manual NAVIGON 81xx
- 14 - Before you begin
On the rear of the navigation device is a ring which fits in the ring of the
cradle.
1. Align the head of cradle so that the button is on top.
2. Tilt the top end of the navigation device slightly towards yourself.
3. Position the recess in the ring of the navigation device so that it fits
in the ring of the cradle. (See illustration)
4. Press the device against the cradle until you hear it lock in place.
Removing the navigation device from the cradle
1. Press the button on top of the cradle.
2. Tilt the navigation device slightly towards yourself.
3. Remove the device from the cradle.
2.5 Navigating with GPS
GPS is based on a total of at least 24 satellites which are circling the
earth and constantly transmitting their position and time. The GPS
receiver receives this data and calculates its own geographical position
on the basis of the information transmitted by the various satellites.
Data from at least three satellites is required for positioning with an
acceptable degree of accuracy. With data from 4 or more satellites it is
possible in addition to determine the position's altitude above sea level.
Positioning is accurate to within three metres.
Once the navigation device has determined your position, this position
can be used as a starting point for calculating a route.
The map data on your navigation device includes the geographical
coordinates of all digitally recorded points of interest, streets and
places. This enables the device to calculate a route between a starting
point and a destination.
Calculation of the current position and its representation on the map
takes place once every second. In other words, your current position is
always shown on the map.