Figure 4.46: Satellite status
Figure
4.46
illustrates the GPS satellite reception page. In this example the LIVE SD shows that 8
satellites are visible, and all 8 are being used to provide the position x. Each bar shows the signal
strength for each individual satellite. A lled bar indicates the LIVE SD has a lock on that satellite.
The position dilution of precision (pdop) shown gives an indication of how reliable the GPS data is at
the moment. The lower the pdop value the more accurate the position x. Values bellow 2.5 are fairly
accurate. If the LIVE SD is switched on in a location where no satellites are visible (indoors for example)
it will go into wide search mode. If this occurs, going outdoors again will make the LIVE SD take an
increased amount of time to pick up satellite signals. If this occurs pushing ENTER on the GPS menu
item will reveal the Reset GPS option, changing it to yes will make the LIVE SD reset the GPS status
and start a new search (see Figure
4.47
). So if you notice LIVE SD is taking abnormally long to get a x
(over 2 minutes) a gps reset will probably get it locked quicker.
Figure 4.47: GPS Reset
56
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