| Each time the navigation control unit is switched on, it attempts to receive satellite signals over the GPS aerial -R50-. |
| The system must be receiving 4 satellites in order to determine the exact position. Only then can the receiver's position be calculated everywhere on the earth's surface. |
| The satellites transmit an identification code, their position and an ultra-accurate time signal towards the earth at intervals of one millisecond. The GPS receiver in the navigation control unit receives the satellite data over the GPS aerial -R50-. The navigation control unit calculates the length of time taken to transfer the data by comparing the time signal with the signal from its own ultra-accurate clock. |
| Once the navigation computer has received data from at least 4 satellites, it can calculate the position of the vehicle. |
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