If the GPS receiver is only able to get signals from three satellites, position can
still be calculated, but less accurately. If only three satellites are available, the
GPS receiver can get an approximate position by making the assumption that
you are at mean sea level. If you really are at sea level, the position will be
reasonably accurate, but if you are driving in the mountains, the two dimensional
x could be several hundreds of metres out (Figures 12.36 and 12.37).
12.3.3 Sensors
The magnetic eld sensor in a GPS unit is a key component (Figure 12.38).
It determines direction of travel in relation to the Earth’s magnetic ...
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