Navigon 10000250 User Manual - Page 15
Switching the navigation device on
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User's manual maps + more Note: A change of memory card is detected only when the device has been switched on. If the memory card is not detected, insert it again when the device is on and running. 2.5 Navigating with GPS GPS is based on a total of at least 24 satellites orbiting the Earth and continuously transmitting signals of 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 four 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 take place approximately once every second. In other words, your current position is always shown on the map. 3 Switching the navigation device on and off The navigation device can be in one of four states: ► On: The navigation device is on and can be operated. ► Screensaver: The navigation device is on. However, you see only a screensaver. As long as the screensaver is visible, the device cannot be operated. The screensaver is available only when the device is mounted in the vehicle. If you switch on the screensaver while navigation is in progress, you will continue to hear the navigation announcements from the device. If music is being played when the screensaver is switched on, the music will continue. ► Standby: When you switch the navigation device to standby mode, the next time it is switched on it will start very quickly. In standby mode the device still consumes a small amount of energy however. Switching the navigation device on and off - 15 -